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x in (-oo:+oo)
(-1/3)*x-((3/7)*x)-(2/7) = -10/21 // + -10/21
(-1/3)*x-((3/7)*x)-(2/7)-(-10/21) = 0
(-1/3)*x+(-3/7)*x-2/7+10/21 = 0
4/21-16/21*x = 0 // - 4/21
-16/21*x = -4/21 // : -16/21
x = -4/21/(-16/21)
x = 1/4
x = 1/4
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