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7+2(a-33)=-9
We move all terms to the left:
7+2(a-33)-(-9)=0
We add all the numbers together, and all the variables
2(a-33)+16=0
We multiply parentheses
2a-66+16=0
We add all the numbers together, and all the variables
2a-50=0
We move all terms containing a to the left, all other terms to the right
2a=50
a=50/2
a=25
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