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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)-(4/7)-(2/5) = 0
(-3/10)*(a-2)-2*a+x-4/7-2/5 = 0
x-3/10*(a-2)-2*a-4/7-2/5 = 0
(-3/10*5*7*(a-2))/(5*7)+(-2*5*7*a)/(5*7)+(5*7*x)/(5*7)+(-4*5)/(5*7)+(-2*7)/(5*7) = 0
5*7*x-3/10*5*7*(a-2)-2*5*7*a-4*5-2*7 = 0
35*x-161/2*a-20-14+21 = 0
35*x-161/2*a-14+1 = 0
35*x-161/2*a-13 = 0
(35*x-161/2*a-13)/(5*7) = 0
(35*x-161/2*a-13)/(5*7) = 0 // * 5*7
35*x-161/2*a-13 = 0
35*x-161/2*a-13 = 0 // + -161/2*a-13
35*x = -(-161/2*a-13) // : 35
x = (-(-161/2*a-13))/35
x = (13-(-161/2*a))/35
x = (13-(-161/2*a))/35
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