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30=12.5x+5
We move all terms to the left:
30-(12.5x+5)=0
We get rid of parentheses
-12.5x-5+30=0
We add all the numbers together, and all the variables
-12.5x+25=0
We move all terms containing x to the left, all other terms to the right
-12.5x=-25
x=-25/-12.5
x=+2
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