Question

calcule o valor das equações

a)4x-7=8x-2
b)2x+1=4x-7
c)9x+9+3x=15
d)16x-1=12x+3
e)3x-2=4x9



​

Answer 1

$a)4x - 7 = 8x - 2 \\ 4x - 8x = - 2 + 7 \\ - 4x = 5 .( - 1) \\ 4x = - 5 \\ x = \frac{5}{4} \\ x = 1.25 \\ </p><p>b)2x + 1 = 4x - 7 \\ 2x - 4x = - 7+ 1 \\ - 2x = - 6.( - 1) \\ 2x = 6 \\ x = \frac{6}{2} \\ x = 3 \\ </p><p>c)9x + 9 + 3x = 15 \\ 9x + 3x = 15 - 9 \\ 12x = 6 \\ x = \frac{6}{12} \\ x = 0.5 \\ </p><p>d)16x - 1 = 12x + 3 \\ 16x - 12x = 3 + 1 \\ 4x = 4 \\ x = \frac{4}{4} \\ x = 1 \\ </p><p>e)3x - 2 = 4x + 9 \\ 3x - 4x = 9 + 2 \\ - x = 11.( - 1) \\ x = - 11$

Espero ter ajudado.