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Simplifying 28 + -7x = 7(1 + -4x) 28 + -7x = (1 * 7 + -4x * 7) 28 + -7x = (7 + -28x) Solving 28 + -7x = 7 + -28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28x' to each side of the equation. 28 + -7x + 28x = 7 + -28x + 28x Combine like terms: -7x + 28x = 21x 28 + 21x = 7 + -28x + 28x Combine like terms: -28x + 28x = 0 28 + 21x = 7 + 0 28 + 21x = 7 Add '-28' to each side of the equation. 28 + -28 + 21x = 7 + -28 Combine like terms: 28 + -28 = 0 0 + 21x = 7 + -28 21x = 7 + -28 Combine like terms: 7 + -28 = -21 21x = -21 Divide each side by '21'. x = -1 Simplifying x = -1
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