Question

@) 2 (3×-1)-4×=7×+4 (2-×)
b) 3 (3-2×)+2 (1+5×)=11×+5 (3-×)

Answer 1

olá...

a) 2(3x -1) -4× = 7× +4(2 -×)
    2.3x -2.1 -4x = 7x +4.2 -4.x
    6x    -2    -4x = 7x +8    -4x
    6x -4x -7x +4x = 8 +2
    10x - 11x = 10
             -1x  = 10
                x  = 10/-1
                x  = -10
 

b) 3(3-2×) +2(1 +5×) = 11× +5(3-×)
    3.3 -3.2x +2.1 +2.5x = 11x +15 - 5x
    9    -6x    +2    +10x  = 11x +15 - 5x
    -6x +10x -11x +5x = 15 -9 -2
    -17x +15x = 15 -11
    -2x = 4
       x = 4/-2
       x = -2