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x in (-oo:+oo)
(1/2)*x-((1/3)*(x-7)) = 3*x // - 3*x
(1/2)*x-((1/3)*(x-7))-(3*x) = 0
(-1/3)*(x-7)+(1/2)*x-3*x = 0
x/2-1/3*(x-7)-3*x = 0
(-1/3*2*(x-7))/2+x/2+(-3*2*x)/2 = 0
x-1/3*2*(x-7)-3*2*x = 0
1/3*x-6*x+14/3 = 0
14/3-17/3*x = 0
(14/3-17/3*x)/2 = 0
(14/3-17/3*x)/2 = 0 // * 2
14/3-17/3*x = 0
14/3-17/3*x = 0 // - 14/3
-17/3*x = -14/3 // : -17/3
x = -14/3/(-17/3)
x = 14/17
x = 14/17
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