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Simplifying 4 + -3(x + 3) = 5x + -21 Reorder the terms: 4 + -3(3 + x) = 5x + -21 4 + (3 * -3 + x * -3) = 5x + -21 4 + (-9 + -3x) = 5x + -21 Combine like terms: 4 + -9 = -5 -5 + -3x = 5x + -21 Reorder the terms: -5 + -3x = -21 + 5x Solving -5 + -3x = -21 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -5 + -3x + -5x = -21 + 5x + -5x Combine like terms: -3x + -5x = -8x -5 + -8x = -21 + 5x + -5x Combine like terms: 5x + -5x = 0 -5 + -8x = -21 + 0 -5 + -8x = -21 Add '5' to each side of the equation. -5 + 5 + -8x = -21 + 5 Combine like terms: -5 + 5 = 0 0 + -8x = -21 + 5 -8x = -21 + 5 Combine like terms: -21 + 5 = -16 -8x = -16 Divide each side by '-8'. x = 2 Simplifying x = 2
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