5(2-5х)-6(2-3х)=2(5-2х)
10-25х-12+18х=10-4х
-25х-12+18х=-4х
-7х-12=-4х
-7х+4х=12
-3х=12
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5(2-5х)-6(2-3х)=2(5-2х)
10-25х-12+18х=10-4х
-25х-12+18х=-4х
-7х-12=-4х
-7х+4х=12
-3х=12
х=-4