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Simplifying 103 + -3x = 15x + 21 Reorder the terms: 103 + -3x = 21 + 15x Solving 103 + -3x = 21 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 103 + -3x + -15x = 21 + 15x + -15x Combine like terms: -3x + -15x = -18x 103 + -18x = 21 + 15x + -15x Combine like terms: 15x + -15x = 0 103 + -18x = 21 + 0 103 + -18x = 21 Add '-103' to each side of the equation. 103 + -103 + -18x = 21 + -103 Combine like terms: 103 + -103 = 0 0 + -18x = 21 + -103 -18x = 21 + -103 Combine like terms: 21 + -103 = -82 -18x = -82 Divide each side by '-18'. x = 4.555555556 Simplifying x = 4.555555556
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