6х+7х=25-12
13х=13
х=1
б) х+18-18х=35
-17х=17
х=-1
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13x=13
x=1
x+18-18x=35
-17x=17
x=-1
6х+7х=25-12
13х=13
х=1
б) х+18-18х=35
-17х=17
х=-1