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(-2/3)*x+x+4 = 7/9-(2*x) // - 7/9-(2*x)
(-2/3)*x+x+2*x-(7/9)+4 = 0
(-2/3)*x+x+2*x-7/9+4 = 0
7/3*x+29/9 = 0 // - 29/9
7/3*x = -29/9 // : 7/3
x = -29/9/7/3
x = -29/21
x = -29/21
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