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x in (-oo:+oo)
-((2/3)*x)-2/7 = (1/2)*x-(55/21) // - (1/2)*x-(55/21)
55/21-((2/3)*x)-((1/2)*x)-2/7 = 0
(-2/3)*x+(-1/2)*x-2/7+55/21 = 0
7/3-7/6*x = 0 // - 7/3
-7/6*x = -7/3 // : -7/6
x = -7/3/(-7/6)
x = 2
x = 2
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