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10x-5(x-2)=40
We move all terms to the left:
10x-5(x-2)-(40)=0
We multiply parentheses
10x-5x+10-40=0
We add all the numbers together, and all the variables
5x-30=0
We move all terms containing x to the left, all other terms to the right
5x=30
x=30/5
x=6
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