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4(7-a)=9(2-a)
We move all terms to the left:
4(7-a)-(9(2-a))=0
We add all the numbers together, and all the variables
4(-1a+7)-(9(-1a+2))=0
We multiply parentheses
-4a-(9(-1a+2))+28=0
We calculate terms in parentheses: -(9(-1a+2)), so:We get rid of parentheses
9(-1a+2)
We multiply parentheses
-9a+18
Back to the equation:
-(-9a+18)
-4a+9a-18+28=0
We add all the numbers together, and all the variables
5a+10=0
We move all terms containing a to the left, all other terms to the right
5a=-10
a=-10/5
a=-2
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