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7x-3(5x+2)=4
We move all terms to the left:
7x-3(5x+2)-(4)=0
We multiply parentheses
7x-15x-6-4=0
We add all the numbers together, and all the variables
-8x-10=0
We move all terms containing x to the left, all other terms to the right
-8x=10
x=10/-8
x=-1+1/4
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