If it's not what You are looking for type in the equation solver your own equation and let us solve it.
w in (-oo:+oo)
w/6.5 = 9.4 // - 9.4
w/6.5-9.4 = 0
0.15384615*w-9.4 = 0 // + 9.4
0.15384615*w = 9.4 // : 0.15384615
w = 9.4/0.15384615
w = 61.10000153
w = 61.10000153
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