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(x+1.3x)=500
We move all terms to the left:
(x+1.3x)-(500)=0
We add all the numbers together, and all the variables
(+2.3x)-500=0
We get rid of parentheses
2.3x-500=0
We move all terms containing x to the left, all other terms to the right
2.3x=500
x=500/2.3
x=217+0.90000000000003/2.3
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