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7x-(2x-1)=8x+3
We move all terms to the left:
7x-(2x-1)-(8x+3)=0
We get rid of parentheses
7x-2x-8x+1-3=0
We add all the numbers together, and all the variables
-3x-2=0
We move all terms containing x to the left, all other terms to the right
-3x=2
x=2/-3
x=-2/3
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