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Simplifying 5x + -4(3x + 7) = 21 Reorder the terms: 5x + -4(7 + 3x) = 21 5x + (7 * -4 + 3x * -4) = 21 5x + (-28 + -12x) = 21 Reorder the terms: -28 + 5x + -12x = 21 Combine like terms: 5x + -12x = -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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