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4(7-a)+9a=43
We move all terms to the left:
4(7-a)+9a-(43)=0
We add all the numbers together, and all the variables
4(-1a+7)+9a-43=0
We add all the numbers together, and all the variables
9a+4(-1a+7)-43=0
We multiply parentheses
9a-4a+28-43=0
We add all the numbers together, and all the variables
5a-15=0
We move all terms containing a to the left, all other terms to the right
5a=15
a=15/5
a=3
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