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x in (-oo:+oo)
(-5/6)*x+10 = (1/3)*x+21/2 // - (1/3)*x+21/2
(-5/6)*x-((1/3)*x)-(21/2)+10 = 0
(-5/6)*x+(-1/3)*x-21/2+10 = 0
-7/6*x-1/2 = 0 // + 1/2
-7/6*x = 1/2 // : -7/6
x = 1/2/(-7/6)
x = -3/7
x = -3/7
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