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x in (-oo:+oo)
(-4/7)*x-(2/3) = -23/21 // + -23/21
(-4/7)*x-(2/3)-(-23/21) = 0
(-4/7)*x-2/3+23/21 = 0
3/7-4/7*x = 0 // - 3/7
-4/7*x = -3/7 // : -4/7
x = -3/7/(-4/7)
x = 3/4
x = 3/4
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