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12.5+30=15x
We move all terms to the left:
12.5+30-(15x)=0
We add all the numbers together, and all the variables
-15x+42.5=0
We move all terms containing x to the left, all other terms to the right
-15x=-42.5
x=-42.5/-15
x=2+3.5714285714286/4.2857142857143
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