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1.2x-3-0.7x=13
We move all terms to the left:
1.2x-3-0.7x-(13)=0
We add all the numbers together, and all the variables
0.5x-16=0
We move all terms containing x to the left, all other terms to the right
0.5x=16
x=16/0.5
x=32
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