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x in (-oo:+oo)
(4/5)*x+8/5 = (3/2)*x+21/10+1/2 // - (3/2)*x+21/10+1/2
(4/5)*x-((3/2)*x)+8/5-(21/10)-(1/2) = 0
(4/5)*x+(-3/2)*x+8/5-21/10-1/2 = 0
-7/10*x-1 = 0 // + 1
-7/10*x = 1 // : -7/10
x = 1/(-7/10)
x = -10/7
x = -10/7
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