Question

1)resolva as equações abaixo:
A)3x+18=30
B)7x-15=48
C)4x-35=3x+41
D)7x+21=-3x+41
E)9x=4x+40
F)15-4x=-2x-25

2) encontre o valor de x nas equações abaixo:
A)2(x-3)=x+41
B)5x=3(x+8)
C)3(x+1)=-4(2x-1)
D)7(x-4(=3(2x+6)
E)4(2x-4)=3(x+10)
F)-3(x-9)=2x+4.

Preciso de ajuda ✨

Answer 1

$1.a)3x + 18 = 30 \\ 3x = 30 - 18 \\ 3x = 12 \\ x = \frac{12}{3} \\ x = 4$

$b)7x - 15 = 48 \\ 7x = 48 + 15 \\ 7x = 63 \\ x = \frac{63}{7} \\ x = 9$

$c)4x - 35 = 3x + 41 \\ 4x - 3x = 41 + 35 \\ x = 76$

$d)7x + 21 = -3x + 41 \\ 7x + 3x = 41 - 21 \\ 10x = 20 \\ x = \frac{20}{10} \\ x = 2$

$e)9x = 4x + 40 \\ 9x - 4x = 40 \\ 5x = 40 \\ x = \frac{40}{5} \\ x = 8$

$f)15 - 4x = - 2x - 25 \\ - 4x + 2x = - 25 - 15 \\ - 2x = - 40 \\ - x = \frac{ - 40}{2} \\ - x = - 20 \times ( - 1) \\ x = 20$

$2.a)2(x - 3) = x + 41 \\ 2x - 6 = x + 41 \\ 2x - x = 41 + 6 \\ x =47$

$b)5x = 3(x - 8) \\ 5x = 3x - 24 \\ 5x - 3x = 24 \\ 2x = 24 \\ x = \frac{24}{2} \\ x = 12$

$c)3(x - 1) = - 4(2x - 1) \\ 3x - 3 = - 8x + 4 \\ 3x + 8x = 4 + 3 \\ 11x = 7 \\ x = \frac{7}{4} \\ x = 0.63$

$d)7(x - 4) = 3(2x + 6) \\ 7x - 28 = 6x + 18 \\ 7x - 6x = 18 + 28 \\ x = 46$

$e)4(2x - 4) = 3(x + 10) \\ 8x - 16 = 3x + 30 \\ 8x - 3x = 30 + 16 \\ 5x = 46 \\ x = \frac{46}{5} \\ x = 9.2$

$f) - 3(x - 9) = 2x + 4 \\ - 3x + 27 = 2x +4 \\ - 3x - 2x = 4 - 27 \\ - 5x = - 23 \\ - x = - \frac{ - 23}{5} \\ - x = - 4.6 \times ( - 1) \\ x = 4.6$