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x in (-oo:+oo)
(5/4)*((6/12)*x-9)+7/2+7/3 = (9/2)*((7/15)*x-((1/10)*x)) // - (9/2)*((7/15)*x-((1/10)*x))
(5/4)*((6/12)*x-9)-((9/2)*((7/15)*x-((1/10)*x)))+7/2+7/3 = 0
(5/4)*((6/12)*x-9)+(-9/2)*((7/15)*x+(-1/10)*x)+7/2+7/3 = 0
5/4*(1/2*x-9)-9/2*11/30*x+7/2+7/3 = 0
(5/4*2*3*(1/2*x-9))/(2*3)+(-9/2*11/30*2*3*x)/(2*3)+(3*7)/(2*3)+(2*7)/(2*3) = 0
5/4*2*3*(1/2*x-9)-9/2*11/30*2*3*x+3*7+2*7 = 0
14-123/20*x-135/2+21 = 0
14-123/20*x-93/2 = 0
-123/20*x-65/2 = 0
(-123/20*x-65/2)/(2*3) = 0
(-123/20*x-65/2)/(2*3) = 0 // * 2*3
-123/20*x-65/2 = 0
-123/20*x-65/2 = 0 // + 65/2
-123/20*x = 65/2 // : -123/20
x = 65/2/(-123/20)
x = -650/123
x = -650/123
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