9(2х+5)-16(5х+7)=42(х-15)

Question

9(2х+5)-16(5х+7)=42(х-15)

Answer 1

18x+45 - 80x-112 = 42x - 630
18x - 80x - 42x = -630 - 45 + 112
-104x = -563
x = -563 : (-104)
x = 5.41