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0.2(100+x)=70+0.1x
We move all terms to the left:
0.2(100+x)-(70+0.1x)=0
We add all the numbers together, and all the variables
0.2(x+100)-(0.1x+70)=0
We multiply parentheses
0.2x-(0.1x+70)+20=0
We get rid of parentheses
0.2x-0.1x-70+20=0
We add all the numbers together, and all the variables
0.1x-50=0
We move all terms containing x to the left, all other terms to the right
0.1x=50
x=50/0.1
x=500
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