How to calculate with unknown number in denominator, such as 1 / x + 1 / x + 5 = 1 / 6

De denominator:
Multiply both sides by 6x (x + 5)
6(x+5)+6x=x(x+5)
12x+30=x^2+5x
x^2-7x-30=0
(x+3)(x-10)=0
x1=-3,x2=10
The test is not root

The triangle on the left below is scaled down to get the triangle on the right and find the unknown X

From the meaning of the question: 4:10 = x: 15, & nbsp; 10x = 4 × 15, & nbsp; & nbsp; 10x = 60, & nbsp; & nbsp; & nbsp; X = 6; a: the length of the reduced edge is 6cm

The triangle on the left below is scaled down to get the triangle on the right and find the unknown X

From the meaning of the question: 4:10 = x: 15, & nbsp; 10x = 4 × 15, & nbsp; & nbsp; 10x = 60, & nbsp; & nbsp; & nbsp; X = 6; a: the length of the reduced edge is 6cm

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