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(2/3)*x = (-5/12)*x-(7/12) // - (-5/12)*x-(7/12)
(2/3)*x-((-5/12)*x)+7/12 = 0
(2/3)*x+(5/12)*x+7/12 = 0
13/12*x+7/12 = 0 // - 7/12
13/12*x = -7/12 // : 13/12
x = -7/12/13/12
x = -7/13
x = -7/13
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