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Simplifying 21x + -5 = 17x + -7 Reorder the terms: -5 + 21x = 17x + -7 Reorder the terms: -5 + 21x = -7 + 17x Solving -5 + 21x = -7 + 17x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17x' to each side of the equation. -5 + 21x + -17x = -7 + 17x + -17x Combine like terms: 21x + -17x = 4x -5 + 4x = -7 + 17x + -17x Combine like terms: 17x + -17x = 0 -5 + 4x = -7 + 0 -5 + 4x = -7 Add '5' to each side of the equation. -5 + 5 + 4x = -7 + 5 Combine like terms: -5 + 5 = 0 0 + 4x = -7 + 5 4x = -7 + 5 Combine like terms: -7 + 5 = -2 4x = -2 Divide each side by '4'. x = -0.5 Simplifying x = -0.5
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