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Mathematics 12 Online
OpenStudy (jkbo):

What is the value of x in the proportion x + 1 / x+3 = 15/ 21 a.4 b.1/3 c.1/4 d.3

OpenStudy (anonymous):

|dw:1341865430576:dw| What is shown in the drawing is something called cross multiplying. After doing so, you can just simplify and solve for x through the equation made.

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