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Simplifying -3x + -13 = x + -21 Reorder the terms: -13 + -3x = x + -21 Reorder the terms: -13 + -3x = -21 + x Solving -13 + -3x = -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. -13 + -3x + -1x = -21 + x + -1x Combine like terms: -3x + -1x = -4x -13 + -4x = -21 + x + -1x Combine like terms: x + -1x = 0 -13 + -4x = -21 + 0 -13 + -4x = -21 Add '13' to each side of the equation. -13 + 13 + -4x = -21 + 13 Combine like terms: -13 + 13 = 0 0 + -4x = -21 + 13 -4x = -21 + 13 Combine like terms: -21 + 13 = -8 -4x = -8 Divide each side by '-4'. x = 2 Simplifying x = 2
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