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Simplifying 21 + -3 = 2x + 4 Combine like terms: 21 + -3 = 18 18 = 2x + 4 Reorder the terms: 18 = 4 + 2x Solving 18 = 4 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 18 + -2x = 4 + 2x + -2x Combine like terms: 2x + -2x = 0 18 + -2x = 4 + 0 18 + -2x = 4 Add '-18' to each side of the equation. 18 + -18 + -2x = 4 + -18 Combine like terms: 18 + -18 = 0 0 + -2x = 4 + -18 -2x = 4 + -18 Combine like terms: 4 + -18 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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