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*x+(1/2)*x = 1.26 // - 1.26
x+2*x+(1/2)*x-1.26 = 0
7/2*x-1.26 = 0 // + 1.26
7/2*x = 1.26 // : 7/2
x = 1.26/7/2
x = 0.36
x = 0.36
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