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multiply both sides by 15 and simplify each fraction separately by cancelling common factors top and bottom.

you will get 3(x+4) + 5(x+7)=9

then multiply out the brackets

3x + 12 + 5x + 35 = 9

obviously that's the same as 8x+47 = 9 so take 47 from both sides

8x =-38 giving x = 4 3/4

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13y ago

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