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74=74(45-2a)
We move all terms to the left:
74-(74(45-2a))=0
We add all the numbers together, and all the variables
-(74(-2a+45))+74=0
We calculate terms in parentheses: -(74(-2a+45)), so:We get rid of parentheses
74(-2a+45)
We multiply parentheses
-148a+3330
Back to the equation:
-(-148a+3330)
148a-3330+74=0
We add all the numbers together, and all the variables
148a-3256=0
We move all terms containing a to the left, all other terms to the right
148a=3256
a=3256/148
a=22
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