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x in (-oo:+oo)
(-1/7)*x-((1/6)*x)+1/2 = -22/21 // + -22/21
(-1/7)*x-((1/6)*x)+1/2-(-22/21) = 0
(-1/7)*x+(-1/6)*x+1/2+22/21 = 0
65/42-13/42*x = 0 // - 65/42
-13/42*x = -65/42 // : -13/42
x = -65/42/(-13/42)
x = 5
x = 5
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