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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
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Continue Learning about Calculus
8x-9 equals 11x plus 12?
8x - 9 = 11x + 12 8x = 11x + 21 -3x = 21 x = -7
Square root x plus 3 equals 12?
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 )
What is 5x equals 4x plus 9?
5x = 4x + 9 x = 9
Answer to x plus 9y equals 18?
x=9 y=1
Is x plus 3xy equals 9 a linear equation?
no
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