Question

Resolva as seguintes equações do primeiro grau com uma incógnita:
A) 9x = 6x + 12
B) 5x - 1 = 3x + 11
C) 2x + 8 = x + 1
D) 3•(m+2)-5•(m+3)= 1
E) 7 (2x-3) +2 (x+1) -5 (x-9) = 3x+10
Se possível, coloque os cálculos pfvr
Me ajudem pfvr

Answer 1

$\sf9x=6x+12$

$\sf9x-6x=12$

$\sf3x=12$

$\sf x=\dfrac{12}{3}$

$\boxed{\sf x=4}$

$\sf5x-1=3x+11$

$\sf5x-3x=11+1$

$\sf2x=12$

$\sf x=\dfrac{12}{2}$

$\boxed{\sf x=6}$

$\sf2x+8=x+1$

$\sf2x-x=1-8$

$\boxed{\sf x=-7}$

$\sf 3(m+2)-5(m+3)=1$

$\sf3m+6-5m-15=1$

$\sf-2m-9=1$

$\sf-2m=1+9$

$\sf-2m=10$

$\sf m=-\dfrac{10}{2}$

$\boxed{\sf m=-5}$

$\sf 7(2x-3)+2(x+1)-5(x-9)=3x+10$

$\sf14x-21+2x+2-5x+45=3x+10$

$\sf11x+26=3x+10$

$\sf11x-3x=10-26$

$\sf8x=-16$

$\sf x=-\dfrac{16}{8}$

$\boxed{\sf x=-2}$