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5x-3(2x-7)=30
We move all terms to the left:
5x-3(2x-7)-(30)=0
We multiply parentheses
5x-6x+21-30=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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