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 = 5.1 // - 5.1
-x/1.5-5.1 = 0
-0.66666667*x-5.1 = 0 // + 5.1
-0.66666667*x = 5.1 // : -0.66666667
x = 5.1/(-0.66666667)
x = -7.64999996
x = -7.64999996
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