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X-((3/4)*(x-30))-30 = 30 // - 30
X-((3/4)*(x-30))-30-30 = 0
(-3/4)*(x-30)+X-30-30 = 0
X-3/4*(x-30)-30-30 = 0
X-3/4*(x-30)-30-30 = 0
X-3/4*x-30-30+45/2 = 0
X-3/4*x-30-15/2 = 0
X-3/4*x-75/2 = 0
X-3/4*x-75/2 = 0
X-3/4*x-75/2 = 0 // - X-75/2
-3/4*x = -(X-75/2) // : -3/4
x = (-(X-75/2))/(-3/4)
x = -4/3*(75/2-X)
x = -4/3*(75/2-X)
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