4(x+5)-2x=21

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Solution for 4(x+5)-2x=21 equation: 


Simplifying
4(x + 5) + -2x = 21

Reorder the terms:
4(5 + x) + -2x = 21
(5 * 4 + x * 4) + -2x = 21
(20 + 4x) + -2x = 21

Combine like terms: 4x + -2x = 2x
20 + 2x = 21

Solving
20 + 2x = 21

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + 2x = 21 + -20

Combine like terms: 20 + -20 = 0
0 + 2x = 21 + -20
2x = 21 + -20

Combine like terms: 21 + -20 = 1
2x = 1

Divide each side by '2'.
x = 0.5

Simplifying
x = 0.5

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