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5*(4*x+1) = -15/2 // + -15/2
5*(4*x+1)-(-15/2) = 0
5*(4*x+1)+15/2 = 0
(2*5*(4*x+1))/2+15/2 = 0
2*5*(4*x+1)+15 = 0
40*x+25 = 0
(40*x+25)/2 = 0
(40*x+25)/2 = 0 // * 2
40*x+25 = 0
40*x+25 = 0 // - 25
40*x = -25 // : 40
x = -25/40
x = -5/8
x = -5/8
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