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8.5x+77.79=-11.5x+77.57
We move all terms to the left:
8.5x+77.79-(-11.5x+77.57)=0
We get rid of parentheses
8.5x+11.5x-77.57+77.79=0
We add all the numbers together, and all the variables
20x+0.22000000000001=0
We move all terms containing x to the left, all other terms to the right
20x=-0.22000000000001
x=-0.22000000000001/20
x=-0.22000000000001/20
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