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0.8x+35=-7x-43
We move all terms to the left:
0.8x+35-(-7x-43)=0
We get rid of parentheses
0.8x+7x+43+35=0
We add all the numbers together, and all the variables
7.8x+78=0
We move all terms containing x to the left, all other terms to the right
7.8x=-78
x=-78/7.8
x=-10
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