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X/2-((3*x)/5) = 121 // - 121
X/2-((3*x)/5)-121 = 0
X/2+(-3/5)*x-121 = 0
1/2*X-3/5*x-121 = 0 // - 1/2*X-121
-3/5*x = -(1/2*X-121) // : -3/5
x = (-(1/2*X-121))/(-3/5)
x = -5/3*(121-(1/2*X))
x = -5/3*(121-(1/2*X))
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