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0.7x-0.8x+4=-7
We move all terms to the left:
0.7x-0.8x+4-(-7)=0
We add all the numbers together, and all the variables
-0.1x+11=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-11
x=-11/-0.1
x=+110
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