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Simplifying -21x + 15 = -5x + 7 Reorder the terms: 15 + -21x = -5x + 7 Reorder the terms: 15 + -21x = 7 + -5x Solving 15 + -21x = 7 + -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. 15 + -21x + 5x = 7 + -5x + 5x Combine like terms: -21x + 5x = -16x 15 + -16x = 7 + -5x + 5x Combine like terms: -5x + 5x = 0 15 + -16x = 7 + 0 15 + -16x = 7 Add '-15' to each side of the equation. 15 + -15 + -16x = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -16x = 7 + -15 -16x = 7 + -15 Combine like terms: 7 + -15 = -8 -16x = -8 Divide each side by '-16'. x = 0.5 Simplifying x = 0.5
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