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Simplifying 21x + 7 = 18x + -8 Reorder the terms: 7 + 21x = 18x + -8 Reorder the terms: 7 + 21x = -8 + 18x Solving 7 + 21x = -8 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. 7 + 21x + -18x = -8 + 18x + -18x Combine like terms: 21x + -18x = 3x 7 + 3x = -8 + 18x + -18x Combine like terms: 18x + -18x = 0 7 + 3x = -8 + 0 7 + 3x = -8 Add '-7' to each side of the equation. 7 + -7 + 3x = -8 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = -8 + -7 3x = -8 + -7 Combine like terms: -8 + -7 = -15 3x = -15 Divide each side by '3'. x = -5 Simplifying x = -5
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