-12 = x+9
x+9 -9 = -12 -9
x = -21
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-12=x+9
-12-9=x+9-9 [ Subtract 9 from both sides of the equation ]
-21=x
So, x=-21
8x - 9 = 11x + 12 8x = 11x + 21 -3x = 21 x = -7
X = 81 sqrt(X) + 3 = 12 ( subtract 3 from each side ) sqrt(X) = 9 (square both sides ) X = 81 ( the square root of 81 is 9 )
5x = 4x + 9 x = 9
x=9 y=1
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