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2x+22+9x-15+4x+11=90
We move all terms to the left:
2x+22+9x-15+4x+11-(90)=0
We add all the numbers together, and all the variables
15x-72=0
We move all terms containing x to the left, all other terms to the right
15x=72
x=72/15
x=4+4/5
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