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0.2(x+30)-0.08(x-20)=10
We move all terms to the left:
0.2(x+30)-0.08(x-20)-(10)=0
We multiply parentheses
0.2x-0.08x+6+1.6-10=0
We add all the numbers together, and all the variables
0.12x-2.4=0
We move all terms containing x to the left, all other terms to the right
0.12x=2.4
x=2.4/0.12
x=20
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