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(5x-x)=30
We move all terms to the left:
(5x-x)-(30)=0
We add all the numbers together, and all the variables
(+4x)-30=0
We get rid of parentheses
4x-30=0
We move all terms containing x to the left, all other terms to the right
4x=30
x=30/4
x=7+1/2
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