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 = 3/6.875+4/7 // - 3/6.875+4/7
y-(3/6.875)-(4/7) = 0
y-4/7-0.43636364 = 0
y-1.00779221 = 0 // + 1.00779221
y = 1.00779221
y = 1.00779221
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