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3x+2x+x=90.000
We move all terms to the left:
3x+2x+x-(90.000)=0
We add all the numbers together, and all the variables
3x+2x+x-90=0
We add all the numbers together, and all the variables
6x-90=0
We move all terms containing x to the left, all other terms to the right
6x=90
x=90/6
x=15
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