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x+0.6x=90
We move all terms to the left:
x+0.6x-(90)=0
We add all the numbers together, and all the variables
1.6x-90=0
We move all terms containing x to the left, all other terms to the right
1.6x=90
x=90/1.6
x=56+0.39999999999999/1.6
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