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(4*x+9)/2-((2*x+15)/4) = 1 // - 1
(4*x+9)/2-((2*x+15)/4)-1 = 0
(4*x+9)/2+(-1*(2*x+15))/4-1 = 0
(4*(4*x+9))/(2*4)+(-1*2*(2*x+15))/(2*4)+(-1*2*4)/(2*4) = 0
4*(4*x+9)-1*2*(2*x+15)-1*2*4 = 0
12*x-8+6 = 0
12*x-2 = 0
(12*x-2)/(2*4) = 0
(12*x-2)/(2*4) = 0 // * 2*4
12*x-2 = 0
12*x-2 = 0 // + 2
12*x = 2 // : 12
x = 2/12
x = 1/6
x = 1/6
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