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20+0.09x=0.13x
We move all terms to the left:
20+0.09x-(0.13x)=0
We add all the numbers together, and all the variables
0.09x-(+0.13x)+20=0
We get rid of parentheses
0.09x-0.13x+20=0
We add all the numbers together, and all the variables
-0.04x+20=0
We move all terms containing x to the left, all other terms to the right
-0.04x=-20
x=-20/-0.04
x=+500
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