4=-2x+21

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Solution for 4=-2x+21 equation:


Simplifying
4 = -2x + 21

Reorder the terms:
4 = 21 + -2x

Solving
4 = 21 + -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.
4 + 2x = 21 + -2x + 2x

Combine like terms: -2x + 2x = 0
4 + 2x = 21 + 0
4 + 2x = 21

Add '-4' to each side of the equation.
4 + -4 + 2x = 21 + -4

Combine like terms: 4 + -4 = 0
0 + 2x = 21 + -4
2x = 21 + -4

Combine like terms: 21 + -4 = 17
2x = 17

Divide each side by '2'.
x = 8.5

Simplifying
x = 8.5

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