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/18 = 7.2 // - 7.2
-x/18-7.2 = 0
-1/18*x-7.2 = 0 // + 7.2
-1/18*x = 7.2 // : -1/18
x = 7.2/(-1/18)
x = -129.59998963
x = -129.59998963
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