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Simplifying 21 + -13 = 2(x + -3) Combine like terms: 21 + -13 = 8 8 = 2(x + -3) Reorder the terms: 8 = 2(-3 + x) 8 = (-3 * 2 + x * 2) 8 = (-6 + 2x) Solving 8 = -6 + 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. 8 + -2x = -6 + 2x + -2x Combine like terms: 2x + -2x = 0 8 + -2x = -6 + 0 8 + -2x = -6 Add '-8' to each side of the equation. 8 + -8 + -2x = -6 + -8 Combine like terms: 8 + -8 = 0 0 + -2x = -6 + -8 -2x = -6 + -8 Combine like terms: -6 + -8 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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