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Simplifying 4(x + -2) = x + 21 Reorder the terms: 4(-2 + x) = x + 21 (-2 * 4 + x * 4) = x + 21 (-8 + 4x) = x + 21 Reorder the terms: -8 + 4x = 21 + x Solving -8 + 4x = 21 + x 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. -8 + 4x + -1x = 21 + x + -1x Combine like terms: 4x + -1x = 3x -8 + 3x = 21 + x + -1x Combine like terms: x + -1x = 0 -8 + 3x = 21 + 0 -8 + 3x = 21 Add '8' to each side of the equation. -8 + 8 + 3x = 21 + 8 Combine like terms: -8 + 8 = 0 0 + 3x = 21 + 8 3x = 21 + 8 Combine like terms: 21 + 8 = 29 3x = 29 Divide each side by '3'. x = 9.666666667 Simplifying x = 9.666666667
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