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x in (-oo:+oo)
(-3/7)*x+x-(1/3) = -5/21 // + -5/21
(-3/7)*x+x-(1/3)-(-5/21) = 0
(-3/7)*x+x-1/3+5/21 = 0
4/7*x-2/21 = 0 // + 2/21
4/7*x = 2/21 // : 4/7
x = 2/21/4/7
x = 1/6
x = 1/6
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