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Simplifying 7x + -21 = 15x Reorder the terms: -21 + 7x = 15x Solving -21 + 7x = 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. -21 + 7x + -15x = 15x + -15x Combine like terms: 7x + -15x = -8x -21 + -8x = 15x + -15x Combine like terms: 15x + -15x = 0 -21 + -8x = 0 Add '21' to each side of the equation. -21 + 21 + -8x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -8x = 0 + 21 -8x = 0 + 21 Combine like terms: 0 + 21 = 21 -8x = 21 Divide each side by '-8'. x = -2.625 Simplifying x = -2.625
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