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Simplifying 135 = 7x + -2(-7x + -15) Reorder the terms: 135 = 7x + -2(-15 + -7x) 135 = 7x + (-15 * -2 + -7x * -2) 135 = 7x + (30 + 14x) Reorder the terms: 135 = 30 + 7x + 14x Combine like terms: 7x + 14x = 21x 135 = 30 + 21x Solving 135 = 30 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 135 + -21x = 30 + 21x + -21x Combine like terms: 21x + -21x = 0 135 + -21x = 30 + 0 135 + -21x = 30 Add '-135' to each side of the equation. 135 + -135 + -21x = 30 + -135 Combine like terms: 135 + -135 = 0 0 + -21x = 30 + -135 -21x = 30 + -135 Combine like terms: 30 + -135 = -105 -21x = -105 Divide each side by '-21'. x = 5 Simplifying x = 5
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