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x+0.6x+0.6x=90
We move all terms to the left:
x+0.6x+0.6x-(90)=0
We add all the numbers together, and all the variables
2.2x-90=0
We move all terms containing x to the left, all other terms to the right
2.2x=90
x=90/2.2
x=40+1/1.1
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