Answer: A = 4
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Work Shown:
-308=4A-9(8+7A)
-308=4A-9(8)-9(7A) ... distribute
-308=4A-72-63A .... multiply
-308=-72-59A ....combine like terms
-308+72=-72-59A+72 ... add 72 to both sides
-236 = -59A
-59A = -236
-59A/(-59) = -236/(-59) ... divide both sides by -59
A = 4
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Explanation:
The idea is to first distribute and combine like terms. From there you follow PEMDAS in reverse to isolate A fully. That's why I added 72 to both sides to undo the subtraction, and divided both sides by -59 to undo the multiplication.
