13=4x+21

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Solution for 13=4x+21 equation:


Simplifying
13 = 4x + 21

Reorder the terms:
13 = 21 + 4x

Solving
13 = 21 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
13 + -4x = 21 + 4x + -4x

Combine like terms: 4x + -4x = 0
13 + -4x = 21 + 0
13 + -4x = 21

Add '-13' to each side of the equation.
13 + -13 + -4x = 21 + -13

Combine like terms: 13 + -13 = 0
0 + -4x = 21 + -13
-4x = 21 + -13

Combine like terms: 21 + -13 = 8
-4x = 8

Divide each side by '-4'.
x = -2

Simplifying
x = -2

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