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/1.5 = 7.5 // - 7.5
x/1.5-7.5 = 0
0.66666667*x-7.5 = 0 // + 7.5
0.66666667*x = 7.5 // : 0.66666667
x = 7.5/0.66666667
x = 11.24999994
x = 11.24999994
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