Question

Assinale o conjunto solução 7.(x+4)-10=4.(x-3), sendo U=IR
a) ( ) {-10}
b) ( ) {-30}
c) ( ) {27}
d) ( ) {15}

Answer 1

7.(x + 4) - 10 = 4.(x - 3)
7x + 28 - 10 = 4x - 12
7x + 18 = 4x - 12
7x - 4x = - 12 - 18
3x = - 30
x = - 30/3
x = - 10

Answer 2

7(x+4)-10=4(x-3)

7x+28-10=4x-12

7x-4x=-12-28+10

3x=-40+10

3x=-30

x=-30/3=-10