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x in (-oo:+oo)
(-7/3)*(3*x-2) = -21 // + 21
(-7/3)*(3*x-2)+21 = 0
21-7/3*(3*x-2) = 0
21-7/3*(3*x-2) = 0
77/3-7*x = 0
77/3-7*x = 0
77/3-7*x = 0 // - 77/3
-7*x = -77/3 // : -7
x = -77/3/(-7)
x = 11/3
x = 11/3
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