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Simplifying 21 + -5x = 13 + -1x Solving 21 + -5x = 13 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 21 + -5x + x = 13 + -1x + x Combine like terms: -5x + x = -4x 21 + -4x = 13 + -1x + x Combine like terms: -1x + x = 0 21 + -4x = 13 + 0 21 + -4x = 13 Add '-21' to each side of the equation. 21 + -21 + -4x = 13 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 13 + -21 -4x = 13 + -21 Combine like terms: 13 + -21 = -8 -4x = -8 Divide each side by '-4'. x = 2 Simplifying x = 2
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