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3(4x-10)=30
We move all terms to the left:
3(4x-10)-(30)=0
We multiply parentheses
12x-30-30=0
We add all the numbers together, and all the variables
12x-60=0
We move all terms containing x to the left, all other terms to the right
12x=60
x=60/12
x=5
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