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X+18.7=197.7-X
We move all terms to the left:
X+18.7-(197.7-X)=0
We add all the numbers together, and all the variables
X-(-1X+197.7)+18.7=0
We get rid of parentheses
X+1X-197.7+18.7=0
We add all the numbers together, and all the variables
2X-179=0
We move all terms containing X to the left, all other terms to the right
2X=179
X=179/2
X=89+1/2
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