If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/15 = 2.5 // - 2.5
x/15-2.5 = 0
1/15*x-2.5 = 0 // + 2.5
1/15*x = 2.5 // : 1/15
x = 2.5/1/15
x = 37.49999813
x = 37.49999813
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