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Simplifying 3x + 13 = 7x + 21 Reorder the terms: 13 + 3x = 7x + 21 Reorder the terms: 13 + 3x = 21 + 7x Solving 13 + 3x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 13 + 3x + -7x = 21 + 7x + -7x Combine like terms: 3x + -7x = -4x 13 + -4x = 21 + 7x + -7x Combine like terms: 7x + -7x = 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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