-(2х-5)-(-3х-7)=3
-2х+5+3х+7=3
-2х+3х=3-5-7
х=-9
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Надеюсь все понятно
-(2х-5)-(-3х-7)=3
-2х+5+3х+7=3
-2х+3х=3-5-7
х=-9