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0.2x+7=-0.8x+10
We move all terms to the left:
0.2x+7-(-0.8x+10)=0
We get rid of parentheses
0.2x+0.8x-10+7=0
We add all the numbers together, and all the variables
x-3=0
We move all terms containing x to the left, all other terms to the right
x=3
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