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Simplifying x + 21 = 4(x + -5) Reorder the terms: 21 + x = 4(x + -5) Reorder the terms: 21 + x = 4(-5 + x) 21 + x = (-5 * 4 + x * 4) 21 + x = (-20 + 4x) Solving 21 + x = -20 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 21 + x + -4x = -20 + 4x + -4x Combine like terms: x + -4x = -3x 21 + -3x = -20 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -3x = -20 + 0 21 + -3x = -20 Add '-21' to each side of the equation. 21 + -21 + -3x = -20 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = -20 + -21 -3x = -20 + -21 Combine like terms: -20 + -21 = -41 -3x = -41 Divide each side by '-3'. x = 13.66666667 Simplifying x = 13.66666667
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