Question

4x-9(x-7)=-12                                              15x(-3-(19-18x))+3x=x+90+2x

Answer 1

15х(-3(19-18))+3х=х+90+2х
15х(-57+54х)+3х=х+90+2х
-855х+660х^+3х=х+90+2х
660х^-855х+3х-х-2х=90
660х^-855х=90
15х(44х-57)=90

1)15х=90 2)44х-57=90
х=6 44х=90-57
44х=33
х=3/4