Реши уравнения 12=(7х-9)-(11-х)

Question

Реши уравнения 12=(7х-9)-(11-х)

Answer 1

12=(7x-9)-(11-x)
12=7x-9-11-x
12=8x-9=11
12=8x-20
-8x+12=-20
-8x=-20-12
-8x=-32
x=4