SOLUTION: 3(21y+14)-3 (4y+7)=0 - 7

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Question 665659: 3(21y+14)-3 (4y+7)=0
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7
Answer by ReadingBoosters(3246) About Me  (Show Source):
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Starting with
3%2F7(21y+14) - 3(4y+7) = 0
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Distribute the 3%2F7 and the 3
3%2F7(21y)+ 3%2F7(14) - 3(4y) -3(7) = 0
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Multiply
3%2F1cross%287%293cross%2821%29y + 3%2F1cross%287%292cross%2814%29 - 12y - 21 = 0
9y + 6 - 12y - 21 = 0
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Combine like terms
highlight%289y%29 + 6 - highlight%2812y%29 - 21 = 0
-3y + highlight%286%29 - highlight%2821%29 = 0
-3y - 15 = 0
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Isolate y
-3y - cross%2815%29 + cross%2815%29 = 0 + 15
-3y = 15
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Divide both sides by -3
cross%28-3%29y%2Fcross%28-3%29+=+15%2F-3
y = -5
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Check