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9x-5(2x-7)=45
We move all terms to the left:
9x-5(2x-7)-(45)=0
We multiply parentheses
9x-10x+35-45=0
We add all the numbers together, and all the variables
-1x-10=0
We move all terms containing x to the left, all other terms to the right
-x=10
x=10/-1
x=-10
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