3x-(5-2x)=-21

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Solution for 3x-(5-2x)=-21 equation:


Simplifying
3x + -1(5 + -2x) = -21
3x + (5 * -1 + -2x * -1) = -21
3x + (-5 + 2x) = -21

Reorder the terms:
-5 + 3x + 2x = -21

Combine like terms: 3x + 2x = 5x
-5 + 5x = -21

Solving
-5 + 5x = -21

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + 5x = -21 + 5

Combine like terms: -5 + 5 = 0
0 + 5x = -21 + 5
5x = -21 + 5

Combine like terms: -21 + 5 = -16
5x = -16

Divide each side by '5'.
x = -3.2

Simplifying
x = -3.2

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