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x in (-oo:+oo)
x-((3*(a-2))/10)-(4/7) = (2*a+2)/5 // - (2*a+2)/5
x-((3*(a-2))/10)-((2*a+2)/5)-(4/7) = 0
(-3/10)*(a-2)-((2*a+2)/5)+x-4/7 = 0
(-1*(2*a+2))/5-3/10*(a-2)+x-4/7 = 0
(-3/10*5*7*(a-2))/(5*7)+(-1*7*(2*a+2))/(5*7)+(5*7*x)/(5*7)+(-4*5)/(5*7) = 0
5*7*x-3/10*5*7*(a-2)-1*7*(2*a+2)-4*5 = 0
35*x-49/2*a-20+7 = 0
35*x-49/2*a-13 = 0
(35*x-49/2*a-13)/(5*7) = 0
(35*x-49/2*a-13)/(5*7) = 0 // * 5*7
35*x-49/2*a-13 = 0
35*x-49/2*a-13 = 0 // + -49/2*a-13
35*x = -(-49/2*a-13) // : 35
x = (-(-49/2*a-13))/35
x = (13-(-49/2*a))/35
x = (13-(-49/2*a))/35
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