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x in (-oo:+oo)
3/8-(6*x)-((2/3)*x) = -29/8 // + -29/8
3/8-(6*x)-((2/3)*x)-(-29/8) = 0
(-2/3)*x-6*x+3/8+29/8 = 0
4-20/3*x = 0 // - 4
-20/3*x = -4 // : -20/3
x = -4/(-20/3)
x = 3/5
x = 3/5
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