Solve equation 1 + 30% x = 21

Solve equation 1 + 30% x = 21


1+30%X=21
1+0.3x=21
0.3x=21-1
0.3x=20
3x=200
x=200/3



Solution equation: (x + 30) / x = 21:20


(x+30)/x=21:20
21x=20(x+30)
21x=20x+600
x=600



Solution equation: 30 / x + 54x = 21


10/x+18x=7
10+18x^2=7x
18x^2-7x+10=0
b^2-4ac



30 / x + 54x = 21


30/x+54x=21
Go to the denominator
30+54x^2=21x
54x^2-21x+30=0
18x^2-7x+10=0
The discriminant B ^ 2-4ac = - 671 from root