Question

1)9 (х +6) =72
2)23 (х- 12)=552
3)15 (2х + 11) =285
4)7 (123-4х ) = 749

Answer 1

1)9х+54=72
9х=72-54
9х=18
х=2
2)23х-276=552
23х=828
х=36
3)30х+165=285
30х=120
х=4
4)861-28х=749
-28х=112
х=-4