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(12+x)+(0.5*3.142x=30
We move all terms to the left:
(12+x)+(0.5*3.142x-(30)=0
We add all the numbers together, and all the variables
(x+12)+(0.5*3.142x-30=0
We get rid of parentheses
x+(0.5*3.142x-30+12=0
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