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(4+3)*a=18
We move all terms to the left:
(4+3)*a-(18)=0
We add all the numbers together, and all the variables
7*a-18=0
We add all the numbers together, and all the variables
7a-18=0
We move all terms containing a to the left, all other terms to the right
7a=18
a=18/7
a=2+4/7
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