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x in (-oo:+oo)
(1/4)*x-(2/7) = (2/3)*x-113/28 // - (2/3)*x-113/28
(1/4)*x-((2/3)*x)-(2/7)-(-113/28) = 0
(1/4)*x+(-2/3)*x-2/7+113/28 = 0
15/4-5/12*x = 0 // - 15/4
-5/12*x = -15/4 // : -5/12
x = -15/4/(-5/12)
x = 9
x = 9
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