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x in (-oo:+oo)
1-((3/4)*x)-((2/7)*x) = -15/14 // + -15/14
1-((3/4)*x)-((2/7)*x)-(-15/14) = 0
(-3/4)*x+(-2/7)*x+15/14+1 = 0
29/14-29/28*x = 0 // - 29/14
-29/28*x = -29/14 // : -29/28
x = -29/14/(-29/28)
x = 2
x = 2
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