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12.5x+4=7x+37
We move all terms to the left:
12.5x+4-(7x+37)=0
We get rid of parentheses
12.5x-7x-37+4=0
We add all the numbers together, and all the variables
5.5x-33=0
We move all terms containing x to the left, all other terms to the right
5.5x=33
x=33/5.5
x=6
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