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22-6a=-4(a-3)
We move all terms to the left:
22-6a-(-4(a-3))=0
We calculate terms in parentheses: -(-4(a-3)), so:We get rid of parentheses
-4(a-3)
We multiply parentheses
-4a+12
Back to the equation:
-(-4a+12)
-6a+4a-12+22=0
We add all the numbers together, and all the variables
-2a+10=0
We move all terms containing a to the left, all other terms to the right
-2a=-10
a=-10/-2
a=+5
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