13=-2x+3(-x+21)

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Solution for 13=-2x+3(-x+21) equation:


Simplifying
13 = -2x + 3(-1x + 21)

Reorder the terms:
13 = -2x + 3(21 + -1x)
13 = -2x + (21 * 3 + -1x * 3)
13 = -2x + (63 + -3x)

Reorder the terms:
13 = 63 + -2x + -3x

Combine like terms: -2x + -3x = -5x
13 = 63 + -5x

Solving
13 = 63 + -5x

Solving for variable 'x'.

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

Add '5x' to each side of the equation.
13 + 5x = 63 + -5x + 5x

Combine like terms: -5x + 5x = 0
13 + 5x = 63 + 0
13 + 5x = 63

Add '-13' to each side of the equation.
13 + -13 + 5x = 63 + -13

Combine like terms: 13 + -13 = 0
0 + 5x = 63 + -13
5x = 63 + -13

Combine like terms: 63 + -13 = 50
5x = 50

Divide each side by '5'.
x = 10

Simplifying
x = 10

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