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)
-96 = 6*x+3*x-6 // - 6*x+3*x-6
6-(6*x)-(3*x)-96 = 0
6-6*x-3*x-96 = 0
-9*x-90 = 0 // + 90
-9*x = 90 // : -9
x = 90/(-9)
x = -10
x = -10
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