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/2.25+6 = -7.61 // + 7.61
x/2.25+6+7.61 = 0
0.44444444*x+13.61 = 0 // - 13.61
0.44444444*x = -13.61 // : 0.44444444
x = -13.61/0.44444444
x = -30.62250031
x = -30.62250031
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