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x in (-oo:+oo)
(12/7)*x-((1/21)*x) = x-(8/3) // - x-(8/3)
(12/7)*x-((1/21)*x)-x+8/3 = 0
(12/7)*x+(-1/21)*x-x+8/3 = 0
2/3*x+8/3 = 0 // - 8/3
2/3*x = -8/3 // : 2/3
x = -8/3/2/3
x = -4
x = -4
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