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(3/4)*(2*r-25)-(1/2) = -5/4 // + -5/4
(3/4)*(2*r-25)-(1/2)-(-5/4) = 0
(3/4)*(2*r-25)-1/2+5/4 = 0
3/4*(2*r-25)-1/2+5/4 = 0
(3/4*2*4*(2*r-25))/(2*4)+(-1*4)/(2*4)+(2*5)/(2*4) = 0
3/4*2*4*(2*r-25)-1*4+2*5 = 0
12*r-154+10 = 0
12*r-144 = 0
(12*r-144)/(2*4) = 0
(12*r-144)/(2*4) = 0 // * 2*4
12*r-144 = 0
12*r-144 = 0 // + 144
12*r = 144 // : 12
r = 144/12
r = 12
r = 12
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