Algebra

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Solve 2+y/7+5=4+1-y/7 for y.

Book says the answer is y=-7

How can this be the answer when the y/7 can each other out when you simplify?

7+y/7=5-y/7
-7____-7
___________

y/7=-2-y/7

This is what I come down to.

  • Algebra -

    they do not cancel each other out, one is positive, the other is negative

    add y/7 to both sides
    2y/7 = -2
    divide by 2 and multiply by 7
    y = -7

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