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75+65(x-1)=660
We move all terms to the left:
75+65(x-1)-(660)=0
We add all the numbers together, and all the variables
65(x-1)-585=0
We multiply parentheses
65x-65-585=0
We add all the numbers together, and all the variables
65x-650=0
We move all terms containing x to the left, all other terms to the right
65x=650
x=650/65
x=10
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