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x in (-oo:+oo)
(2/7)*x+2/3 = -4*x-(37/12) // + -4*x-(37/12)
(2/7)*x-(-4*x)+2/3+37/12 = 0
(2/7)*x+4*x+2/3+37/12 = 0
30/7*x+15/4 = 0 // - 15/4
30/7*x = -15/4 // : 30/7
x = -15/4/30/7
x = -7/8
x = -7/8
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