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Simplifying 400 = 2(2x + -7) + 2x Reorder the terms: 400 = 2(-7 + 2x) + 2x 400 = (-7 * 2 + 2x * 2) + 2x 400 = (-14 + 4x) + 2x Combine like terms: 4x + 2x = 6x 400 = -14 + 6x Solving 400 = -14 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 400 + -6x = -14 + 6x + -6x Combine like terms: 6x + -6x = 0 400 + -6x = -14 + 0 400 + -6x = -14 Add '-400' to each side of the equation. 400 + -400 + -6x = -14 + -400 Combine like terms: 400 + -400 = 0 0 + -6x = -14 + -400 -6x = -14 + -400 Combine like terms: -14 + -400 = -414 -6x = -414 Divide each side by '-6'. x = 69 Simplifying x = 69
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