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 = 0.8 // - 0.8
x/1.5-0.8 = 0
0.66666667*x-0.8 = 0 // + 0.8
0.66666667*x = 0.8 // : 0.66666667
x = 0.8/0.66666667
x = 1.19999999
x = 1.19999999
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