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x in (-oo:+oo)
(-3/4)*x-(1/3) = -((3/7)*x)-1/84 // + -((3/7)*x)-1/84
(-3/4)*x+(3/7)*x-(1/3)-(-1/84) = 0
(-3/4)*x+(3/7)*x-1/3+1/84 = 0
-9/28*x-9/28 = 0 // + 9/28
-9/28*x = 9/28 // : -9/28
x = 9/28/(-9/28)
x = -1
x = -1
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