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Simplifying 4x + 45 = x + 21 Reorder the terms: 45 + 4x = x + 21 Reorder the terms: 45 + 4x = 21 + x Solving 45 + 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. 45 + 4x + -1x = 21 + x + -1x Combine like terms: 4x + -1x = 3x 45 + 3x = 21 + x + -1x Combine like terms: x + -1x = 0 45 + 3x = 21 + 0 45 + 3x = 21 Add '-45' to each side of the equation. 45 + -45 + 3x = 21 + -45 Combine like terms: 45 + -45 = 0 0 + 3x = 21 + -45 3x = 21 + -45 Combine like terms: 21 + -45 = -24 3x = -24 Divide each side by '3'. x = -8 Simplifying x = -8
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