s/2+7=4 - solution

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Solution for s/2+7=4 equation:

s in (-oo:+oo)

s/2+7 = 4 // - 4

s/2-4+7 = 0

1/2*s+3 = 0 // - 3

1/2*s = -3 // : 1/2

s = -3/1/2

s = -6

s = -6

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