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)
(2/3)*y+(1/3)*y = 19 // - 19
(2/3)*y+(1/3)*y-19 = 0
y-19 = 0 // + 19
y = 19
y = 19
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