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x in (-oo:+oo)
(-5/6)*x-((2/7)*x)+1 = -214/21 // + -214/21
(-5/6)*x-((2/7)*x)-(-214/21)+1 = 0
(-5/6)*x+(-2/7)*x+214/21+1 = 0
235/21-47/42*x = 0 // - 235/21
-47/42*x = -235/21 // : -47/42
x = -235/21/(-47/42)
x = 10
x = 10
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