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