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/13.5 = 9.7 // - 9.7
W/13.5-9.7 = 0
0.07407407*W-9.7 = 0 // + 9.7
0.07407407*W = 9.7 // : 0.07407407
W = 9.7/0.07407407
W = 130.9500072
W = 130.9500072
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