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)
-14.9 = y/2-2.1 // - y/2-2.1
2.1-(y/2)-14.9 = 0
-1/2*y-12.8 = 0 // + 12.8
-1/2*y = 12.8 // : -1/2
y = 12.8/(-1/2)
y = -25.6
y = -25.6
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