Х+7-2х=10
-х=3
х=-3
корень уравнения -3
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3х+4х=19-5 х+3-6х=23
7х=14 -5х=20
х=2 х=-4
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1/3х-1=1/4х+1/5
1/3х-1/4х=1+1/5
1/12х=1 1/5
х=14 2/5
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9х+6-8х+4=24
х=24-6-4
х=14