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4(2.5x-2)=12
We move all terms to the left:
4(2.5x-2)-(12)=0
We multiply parentheses
8x-8-12=0
We add all the numbers together, and all the variables
8x-20=0
We move all terms containing x to the left, all other terms to the right
8x=20
x=20/8
x=2+1/2
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