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-0.6x-0.7x+0.50x=-56
We move all terms to the left:
-0.6x-0.7x+0.50x-(-56)=0
We add all the numbers together, and all the variables
-0.8x+56=0
We move all terms containing x to the left, all other terms to the right
-0.8x=-56
x=-56/-0.8
x=+70
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