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0.7(x+100)=0.78x-498
We move all terms to the left:
0.7(x+100)-(0.78x-498)=0
We multiply parentheses
0.7x-(0.78x-498)+70=0
We get rid of parentheses
0.7x-0.78x+498+70=0
We add all the numbers together, and all the variables
-0.08x+568=0
We move all terms containing x to the left, all other terms to the right
-0.08x=-568
x=-568/-0.08
x=+7100
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