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19x-(7x-9)=69
We move all terms to the left:
19x-(7x-9)-(69)=0
We get rid of parentheses
19x-7x+9-69=0
We add all the numbers together, and all the variables
12x-60=0
We move all terms containing x to the left, all other terms to the right
12x=60
x=60/12
x=5
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