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Simplifying 3x + -1(-2x) + 21 = -1x + -1x Remove parenthesis around (-2x) 3x + -1 * -2x + 21 = -1x + -1x Multiply -1 * -2 3x + 2x + 21 = -1x + -1x Reorder the terms: 21 + 3x + 2x = -1x + -1x Combine like terms: 3x + 2x = 5x 21 + 5x = -1x + -1x Combine like terms: -1x + -1x = -2x 21 + 5x = -2x Solving 21 + 5x = -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 21 + 5x + 2x = -2x + 2x Combine like terms: 5x + 2x = 7x 21 + 7x = -2x + 2x Combine like terms: -2x + 2x = 0 21 + 7x = 0 Add '-21' to each side of the equation. 21 + -21 + 7x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = 0 + -21 7x = 0 + -21 Combine like terms: 0 + -21 = -21 7x = -21 Divide each side by '7'. x = -3 Simplifying x = -3
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