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Simplifying 28 + -1(x + 7) = 7x + -3 Reorder the terms: 28 + -1(7 + x) = 7x + -3 28 + (7 * -1 + x * -1) = 7x + -3 28 + (-7 + -1x) = 7x + -3 Combine like terms: 28 + -7 = 21 21 + -1x = 7x + -3 Reorder the terms: 21 + -1x = -3 + 7x Solving 21 + -1x = -3 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 21 + -1x + -7x = -3 + 7x + -7x Combine like terms: -1x + -7x = -8x 21 + -8x = -3 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -8x = -3 + 0 21 + -8x = -3 Add '-21' to each side of the equation. 21 + -21 + -8x = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -8x = -3 + -21 -8x = -3 + -21 Combine like terms: -3 + -21 = -24 -8x = -24 Divide each side by '-8'. x = 3 Simplifying x = 3
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