15-12=x/-7 - solution

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Solution for 15-12=x/-7 equation:

x in (-oo:+oo)

15-12 = x/(-7) // - x/(-7)

15-(x/(-7))-12 = 0

1/7*x+3 = 0 // - 3

1/7*x = -3 // : 1/7

x = -3/1/7

x = -21

x = -21

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