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0.40(x-25)=12
We move all terms to the left:
0.40(x-25)-(12)=0
We multiply parentheses
0.4x-10-12=0
We add all the numbers together, and all the variables
0.4x-22=0
We move all terms containing x to the left, all other terms to the right
0.4x=22
x=22/0.4
x=55
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