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6x+9(x+5)=90
We move all terms to the left:
6x+9(x+5)-(90)=0
We multiply parentheses
6x+9x+45-90=0
We add all the numbers together, and all the variables
15x-45=0
We move all terms containing x to the left, all other terms to the right
15x=45
x=45/15
x=3
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