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210 = (1/2)*x*(3*x-1) // - (1/2)*x*(3*x-1)
210-((1/2)*x*(3*x-1)) = 0
(-1/2)*x*(3*x-1)+210 = 0
210-1/2*x*(3*x-1) = 0
210-1/2*x*(3*x-1) = 0
1/2*x-3/2*x^2+210 = 0
1/2*x-3/2*x^2+210 = 0
1/2*x-3/2*x^2+210 = 0
DELTA = (1/2)^2-(-3/2*4*210)
DELTA = 5041/4
DELTA > 0
x = ((5041/4)^(1/2)-1/2)/(-3/2*2) or x = (-(5041/4)^(1/2)-1/2)/(-3/2*2)
x = -35/3 or x = 12
(x+35/3)*(x-12) = 0
(x+35/3)*(x-12) = 0
( x+35/3 )
x+35/3 = 0 // - 35/3
x = -35/3
( x-12 )
x-12 = 0 // + 12
x = 12
x in { -35/3, 12 }
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