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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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