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(5*x+9)/2+(8*x+2)/4 = -31 // + 31
(5*x+9)/2+(8*x+2)/4+31 = 0
(4*(5*x+9))/(2*4)+(2*(8*x+2))/(2*4)+(2*4*31)/(2*4) = 0
4*(5*x+9)+2*(8*x+2)+2*4*31 = 0
36*x+40+248 = 0
36*x+288 = 0
(36*x+288)/(2*4) = 0
(36*x+288)/(2*4) = 0 // * 2*4
36*x+288 = 0
36*x+288 = 0 // - 288
36*x = -288 // : 36
x = -288/36
x = -8
x = -8
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