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 = 7-7/4 // - 7-7/4
y-(-7/4)-7 = 0
y+7/4-7 = 0
y-21/4 = 0 // + 21/4
y = 21/4
y = 21/4
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