2(-5у+10)=-80
-5у+10=-80÷2
-5у+10=-40
-5у=-40-10
-5у=-50
у=-50÷5
у=-10
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2(-5у+10)=-80
-5у+10=-80÷2
-5у+10=-40
-5у=-40-10
-5у=-50
у=-50÷5
у=-10