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1.2x-3-0.7x=15.5
We move all terms to the left:
1.2x-3-0.7x-(15.5)=0
We add all the numbers together, and all the variables
0.5x-18.5=0
We move all terms containing x to the left, all other terms to the right
0.5x=18.5
x=18.5/0.5
x=37
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