а)13x-12x+8x+10=57
9x+10=57
9x=47
x=47:9
x=
б) (72-4x):6=12
72-4х=12*6
72-4x=72
-4x=72-72
-4x=0 => x=0.
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а)13x-12x+8x+10=57
9x+10=57
9x=47
x=47:9
x=
б) (72-4x):6=12
72-4х=12*6
72-4x=72
-4x=72-72
-4x=0 => x=0.
9х=47
х=47:9
х=9
б)(72-4х):6=12
не знаю я тупая