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50*x-(25*(7-(4*x))) = ((10*x)/70)*(x+4) // - ((10*x)/70)*(x+4)
50*x-(25*(7-(4*x)))-(((10*x)/70)*(x+4)) = 0
(-1/7)*x*(x+4)-25*(7-4*x)+50*x = 0
50*x-25*(7-4*x)-1/7*x*(x+4) = 0
50*x-25*(7-4*x)-1/7*x*(x+4) = 0
696/7*x-1/7*x^2+50*x-175 = 0
1046/7*x-1/7*x^2-175 = 0
1046/7*x-1/7*x^2-175 = 0
1046/7*x-1/7*x^2-175 = 0
DELTA = (1046/7)^2-(-175*(-1/7)*4)
DELTA = 1089216/49
DELTA > 0
x = ((1089216/49)^(1/2)-1046/7)/(-1/7*2) or x = (-(1089216/49)^(1/2)-1046/7)/(-1/7*2)
x = -7/2*((1089216/49)^(1/2)-1046/7) or x = 7/2*((1089216/49)^(1/2)+1046/7)
(x+7/2*((1089216/49)^(1/2)-1046/7))*(x-7/2*((1089216/49)^(1/2)+1046/7)) = 0
(x+7/2*((1089216/49)^(1/2)-1046/7))*(x-7/2*((1089216/49)^(1/2)+1046/7)) = 0
( x+7/2*((1089216/49)^(1/2)-1046/7) )
x+7/2*((1089216/49)^(1/2)-1046/7) = 0 // - 7/2*((1089216/49)^(1/2)-1046/7)
x = -(7/2*((1089216/49)^(1/2)-1046/7))
x = -7/2*((1089216/49)^(1/2)-1046/7)
( x-7/2*((1089216/49)^(1/2)+1046/7) )
x-7/2*((1089216/49)^(1/2)+1046/7) = 0 // + -7/2*((1089216/49)^(1/2)+1046/7)
x = -(-7/2*((1089216/49)^(1/2)+1046/7))
x = 7/2*((1089216/49)^(1/2)+1046/7)
x in { -7/2*((1089216/49)^(1/2)-1046/7), 7/2*((1089216/49)^(1/2)+1046/7) }
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