7-21-3=2x

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Solution for 7-21-3=2x equation:


Simplifying
7 + -21 + -3 = 2x

Combine like terms: 7 + -21 = -14
-14 + -3 = 2x

Combine like terms: -14 + -3 = -17
-17 = 2x

Solving
-17 = 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
-17 + -2x = 2x + -2x

Combine like terms: 2x + -2x = 0
-17 + -2x = 0

Add '17' to each side of the equation.
-17 + 17 + -2x = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -2x = 0 + 17
-2x = 0 + 17

Combine like terms: 0 + 17 = 17
-2x = 17

Divide each side by '-2'.
x = -8.5

Simplifying
x = -8.5

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