3(x+y) - 5x-5y=3(x+y) - 5(x+y)=-2(x+y)= - 2·8= - 16
a+3/2b=(4a+6b):4=16:4=4
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3(x+y) - 5x-5y=3(x+y) - 5(x+y)=-2(x+y)= - 2·8= - 16
a+3/2b=(4a+6b):4=16:4=4