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x in (-oo:+oo)
70.2/90 = x/13.5 // - x/13.5
70.2/90-(x/13.5) = 0
70.2/90-0.07407407*x = 0
0.78-0.07407407*x = 0 // - 0.78
-0.07407407*x = -0.78 // : -0.07407407
x = -0.78/(-0.07407407)
x = 10.53000058
x = 10.53000058
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