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Simplifying 4(x + 21) + -3(-1x + 7) = -28 Reorder the terms: 4(21 + x) + -3(-1x + 7) = -28 (21 * 4 + x * 4) + -3(-1x + 7) = -28 (84 + 4x) + -3(-1x + 7) = -28 Reorder the terms: 84 + 4x + -3(7 + -1x) = -28 84 + 4x + (7 * -3 + -1x * -3) = -28 84 + 4x + (-21 + 3x) = -28 Reorder the terms: 84 + -21 + 4x + 3x = -28 Combine like terms: 84 + -21 = 63 63 + 4x + 3x = -28 Combine like terms: 4x + 3x = 7x 63 + 7x = -28 Solving 63 + 7x = -28 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 + 7x = -28 + -63 Combine like terms: 63 + -63 = 0 0 + 7x = -28 + -63 7x = -28 + -63 Combine like terms: -28 + -63 = -91 7x = -91 Divide each side by '7'. x = -13 Simplifying x = -13
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