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(2/3)*x-(7/10) = (5/7)*x-(1403/1890) // - (5/7)*x-(1403/1890)
(2/3)*x-((5/7)*x)-(7/10)+1403/1890 = 0
(2/3)*x+(-5/7)*x-7/10+1403/1890 = 0
8/189-1/21*x = 0 // - 8/189
-1/21*x = -8/189 // : -1/21
x = -8/189/(-1/21)
x = 8/9
x = 8/9
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