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0.2x+3.7=0.7x-0.8
We move all terms to the left:
0.2x+3.7-(0.7x-0.8)=0
We get rid of parentheses
0.2x-0.7x+0.8+3.7=0
We add all the numbers together, and all the variables
-0.5x+4.5=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-4.5
x=-4.5/-0.5
x=+9
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