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Simplifying -21 + -5x = 4(7 + -3x) -21 + -5x = (7 * 4 + -3x * 4) -21 + -5x = (28 + -12x) Solving -21 + -5x = 28 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. -21 + -5x + 12x = 28 + -12x + 12x Combine like terms: -5x + 12x = 7x -21 + 7x = 28 + -12x + 12x Combine like terms: -12x + 12x = 0 -21 + 7x = 28 + 0 -21 + 7x = 28 Add '21' to each side of the equation. -21 + 21 + 7x = 28 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = 28 + 21 7x = 28 + 21 Combine like terms: 28 + 21 = 49 7x = 49 Divide each side by '7'. x = 7 Simplifying x = 7
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