simplyfy (4.5x+3y)-(6.5+2y+3)-6x+7y
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(4.5x+3y)-(6.5+2y+3)-6x+7y
=4.5x+3y-6.5-2y-3-6x+7y
=10y-1.5x-2y-9.5
=8y-1.5x-9.5
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