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Simplifying 7(4x + -9) + -7x = 0 Reorder the terms: 7(-9 + 4x) + -7x = 0 (-9 * 7 + 4x * 7) + -7x = 0 (-63 + 28x) + -7x = 0 Combine like terms: 28x + -7x = 21x -63 + 21x = 0 Solving -63 + 21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 21x = 0 + 63 Combine like terms: -63 + 63 = 0 0 + 21x = 0 + 63 21x = 0 + 63 Combine like terms: 0 + 63 = 63 21x = 63 Divide each side by '21'. x = 3 Simplifying x = 3
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