5x+3x+5x=-21

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Solution for 5x+3x+5x=-21 equation: 


Simplifying
5x + 3x + 5x = -21

Combine like terms: 5x + 3x = 8x
8x + 5x = -21

Combine like terms: 8x + 5x = 13x
13x = -21

Solving
13x = -21

Solving for variable 'x'.

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

Divide each side by '13'.
x = -1.615384615

Simplifying
x = -1.615384615

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