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Simplifying 15x + 21 = 7x + -19 Reorder the terms: 21 + 15x = 7x + -19 Reorder the terms: 21 + 15x = -19 + 7x Solving 21 + 15x = -19 + 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. 21 + 15x + -7x = -19 + 7x + -7x Combine like terms: 15x + -7x = 8x 21 + 8x = -19 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + 8x = -19 + 0 21 + 8x = -19 Add '-21' to each side of the equation. 21 + -21 + 8x = -19 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = -19 + -21 8x = -19 + -21 Combine like terms: -19 + -21 = -40 8x = -40 Divide each side by '8'. x = -5 Simplifying x = -5
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