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Simplifying 7x + -7(4x + 15) = 0 Reorder the terms: 7x + -7(15 + 4x) = 0 7x + (15 * -7 + 4x * -7) = 0 7x + (-105 + -28x) = 0 Reorder the terms: -105 + 7x + -28x = 0 Combine like terms: 7x + -28x = -21x -105 + -21x = 0 Solving -105 + -21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '105' to each side of the equation. -105 + 105 + -21x = 0 + 105 Combine like terms: -105 + 105 = 0 0 + -21x = 0 + 105 -21x = 0 + 105 Combine like terms: 0 + 105 = 105 -21x = 105 Divide each side by '-21'. x = -5 Simplifying x = -5
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