5*(x+4)+4*(x-4)=166
5x+20+4x-16=166
5x+4x=166-20+16
9x=162
x=162/9
x=18
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5*(x+4)+4*(x-4)=166
5x+20+4x-16=166
5x+4x=166-20+16
9x=162
x=162/9
x=18