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26 June, 19:12

Solve 20x + 5y = 15 for y.

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  1. 26 June, 20:14
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    20x + 5y = 15

    Move 20x to the other side. Sign changes from + 20x to - 20x

    20x-20x+5y=-20x+15

    5y=-20x+15

    Divide both sides by 5

    5y/5=y (Cross out 5 and 5, divide by 5, 1*1*y=y)

    -20/5=-4x

    15/5=3

    y=-4x+3 or y=3-4x

    Answer: y=-4x+3 or y=3-4x
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