If it's not what You are looking for type in the equation solver your own equation and let us solve it.
y in (-oo:+oo)
y/0.8 = -2.9 // + 2.9
y/0.8+2.9 = 0
1.25*y+2.9 = 0 // - 2.9
1.25*y = -2.9 // : 1.25
y = -2.9/1.25
y = -2.32
y = -2.32
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