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Simplifying 21x + -15 = 18x + -7 Reorder the terms: -15 + 21x = 18x + -7 Reorder the terms: -15 + 21x = -7 + 18x Solving -15 + 21x = -7 + 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. -15 + 21x + -18x = -7 + 18x + -18x Combine like terms: 21x + -18x = 3x -15 + 3x = -7 + 18x + -18x Combine like terms: 18x + -18x = 0 -15 + 3x = -7 + 0 -15 + 3x = -7 Add '15' to each side of the equation. -15 + 15 + 3x = -7 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = -7 + 15 3x = -7 + 15 Combine like terms: -7 + 15 = 8 3x = 8 Divide each side by '3'. x = 2.666666667 Simplifying x = 2.666666667
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