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 = 6.875*(3/7)+4/7 // - 6.875*(3/7)+4/7
y-(6.875*(3/7))-(4/7) = 0
y-4/7-2.94642857 = 0
y-3.51785714 = 0 // + 3.51785714
y = 3.51785714
y = 3.51785714
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