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4x+2(4x-3)=30
We move all terms to the left:
4x+2(4x-3)-(30)=0
We multiply parentheses
4x+8x-6-30=0
We add all the numbers together, and all the variables
12x-36=0
We move all terms containing x to the left, all other terms to the right
12x=36
x=36/12
x=3
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