8 = 10x/(10 + x)
Multiply both sides by (10 + x) to give: 8*(10+x) = 10x
Simplify: 80 + 8x = 10x
Subtract 8x from both sides: 80 = 2x
Divide both sides by 2: 40 = x
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2x/3 = 8 + 4x2x = 24 + 12x-24 = 10x-2.4 = x
You find x. Oh! There it is!! ^ See?
12x - 6 = 10x +2 12x - 10x = 2 + 6 2x = 8 x = 4
x - 10x = 9x, so 9x + 3 = 0, so 9x = -3 so x = -1/3
x2 + 10x + 21 = (x + 3)(x + 7)