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0.7x-14=-3.5
We move all terms to the left:
0.7x-14-(-3.5)=0
We add all the numbers together, and all the variables
0.7x-10.5=0
We move all terms containing x to the left, all other terms to the right
0.7x=10.5
x=10.5/0.7
x=15
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