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x in (-oo:+oo)
(5/7)*x-(2/3) = -26/21 // + -26/21
(5/7)*x-(2/3)-(-26/21) = 0
(5/7)*x-2/3+26/21 = 0
5/7*x+4/7 = 0 // - 4/7
5/7*x = -4/7 // : 5/7
x = -4/7/5/7
x = -4/5
x = -4/5
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