6x+9-16x=-21

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Solution for 6x+9-16x=-21 equation:


Simplifying
6x + 9 + -16x = -21

Reorder the terms:
9 + 6x + -16x = -21

Combine like terms: 6x + -16x = -10x
9 + -10x = -21

Solving
9 + -10x = -21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + -10x = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -10x = -21 + -9
-10x = -21 + -9

Combine like terms: -21 + -9 = -30
-10x = -30

Divide each side by '-10'.
x = 3

Simplifying
x = 3

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