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/3.5+15 = 17 // - 17
y/3.5-17+15 = 0
0.28571429*y-2 = 0 // + 2
0.28571429*y = 2 // : 0.28571429
y = 2/0.28571429
y = 6.9999999
y = 6.9999999
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