105
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21x + 9 = 180 21x = 180 - 9 21x = 171 x = 171/21 x = 8.143
If: 9x = 21x-3 Then: x = 1/4 or 0.25
x2 - 21x = 72x2 - 21x - 72 = 0(x - 24) (x + 3) = 0x = 24x = -3
The equation "9n equals 126" can be written as 9n = 126.
20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19