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x in (-oo:+oo)
1/4-((1/3)*x) = (-3/7)*x+11/12 // - (-3/7)*x+11/12
1/4-((1/3)*x)-((-3/7)*x)-(11/12) = 0
(-1/3)*x+(3/7)*x+1/4-11/12 = 0
2/21*x-2/3 = 0 // + 2/3
2/21*x = 2/3 // : 2/21
x = 2/3/2/21
x = 7
x = 7
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