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Simplifying 21 = 5x + -4(x + -7) Reorder the terms: 21 = 5x + -4(-7 + x) 21 = 5x + (-7 * -4 + x * -4) 21 = 5x + (28 + -4x) Reorder the terms: 21 = 28 + 5x + -4x Combine like terms: 5x + -4x = 1x 21 = 28 + 1x Solving 21 = 28 + 1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 21 + -1x = 28 + 1x + -1x Combine like terms: 1x + -1x = 0 21 + -1x = 28 + 0 21 + -1x = 28 Add '-21' to each side of the equation. 21 + -21 + -1x = 28 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 28 + -21 -1x = 28 + -21 Combine like terms: 28 + -21 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7
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