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a in (-oo:+oo)
10/3-((40*a)/3) = (4/3)*(-3*a-2)+(-7*a)/3 // - (4/3)*(-3*a-2)+(-7*a)/3
10/3-((4/3)*(-3*a-2))-((40*a)/3)-((-7*a)/3) = 0
(-4/3)*(-3*a-2)+(-40/3)*a+(7/3)*a+10/3 = 0
(-40*a)/3-4/3*(-3*a-2)+(7*a)/3+10/3 = 0
(-4/3*3*(-3*a-2))/3+(-40*a)/3+(7*a)/3+10/3 = 0
7*a-4/3*3*(-3*a-2)-40*a+10 = 0
7*a-28*a+8+10 = 0
8-21*a+10 = 0
18-21*a = 0
(18-21*a)/3 = 0
(18-21*a)/3 = 0 // * 3
18-21*a = 0
18-21*a = 0 // - 18
-21*a = -18 // : -21
a = -18/(-21)
a = 6/7
a = 6/7
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