12-3(2х+5)= 2(9-5х)+31
12-6х-15=18-10х+31
-6х-3=-10х+49
4х=52
х=13
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12-3(2х+5)= 2(9-5х)+31
12-6х-15=18-10х+31
-6х-3=-10х+49
4х=52
х=13