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x in (-oo:+oo)
(1/3)*x-((1/4)*(x-3)) = 4*x // - 4*x
(1/3)*x-((1/4)*(x-3))-(4*x) = 0
(-1/4)*(x-3)+(1/3)*x-4*x = 0
x/3-1/4*(x-3)-4*x = 0
(-1/4*3*(x-3))/3+x/3+(-4*3*x)/3 = 0
x-1/4*3*(x-3)-4*3*x = 0
1/4*x-12*x+9/4 = 0
9/4-47/4*x = 0
(9/4-47/4*x)/3 = 0
(9/4-47/4*x)/3 = 0 // * 3
9/4-47/4*x = 0
9/4-47/4*x = 0 // - 9/4
-47/4*x = -9/4 // : -47/4
x = -9/4/(-47/4)
x = 9/47
x = 9/47
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