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6x+6x+15+6x+10=90
We move all terms to the left:
6x+6x+15+6x+10-(90)=0
We add all the numbers together, and all the variables
18x-65=0
We move all terms containing x to the left, all other terms to the right
18x=65
x=65/18
x=3+11/18
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