Question

Tìm x biết :

-2x - 40 = (5 - x) - (-15 + 60)

Answer 1

-2x-40=(5-x)-(-15+60)

=>-2x-40=5-x+15-60

=>-2x+x=5+15-60+40

=>-x=20-60+40=0

=>x=0

Answer 2

-2x-40=(5-x)-(-15+60)

-2x-40=5-x-45

-2x+x=5-45+40

-x       =0

x        =0