y/0.4=-4.2 - solution

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Solution for y/0.4=-4.2 equation:

y in (-oo:+oo)

y/0.4 = -4.2 // + 4.2

y/0.4+4.2 = 0

2.5*y+4.2 = 0 // - 4.2

2.5*y = -4.2 // : 2.5

y = -4.2/2.5

y = -1.68

y = -1.68

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