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18+1.8x=-3.6
We move all terms to the left:
18+1.8x-(-3.6)=0
We add all the numbers together, and all the variables
1.8x+21.6=0
We move all terms containing x to the left, all other terms to the right
1.8x=-21.6
x=-21.6/1.8
x=-12
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