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Simplifying 78 = 2x + 2(18) Multiply 2 * 18 78 = 2x + 36 Reorder the terms: 78 = 36 + 2x Solving 78 = 36 + 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. 78 + -2x = 36 + 2x + -2x Combine like terms: 2x + -2x = 0 78 + -2x = 36 + 0 78 + -2x = 36 Add '-78' to each side of the equation. 78 + -78 + -2x = 36 + -78 Combine like terms: 78 + -78 = 0 0 + -2x = 36 + -78 -2x = 36 + -78 Combine like terms: 36 + -78 = -42 -2x = -42 Divide each side by '-2'. x = 21 Simplifying x = 21
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