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0.5x+6-0.2x=-15
We move all terms to the left:
0.5x+6-0.2x-(-15)=0
We add all the numbers together, and all the variables
0.3x+21=0
We move all terms containing x to the left, all other terms to the right
0.3x=-21
x=-21/0.3
x=-70
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