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Simplifying 7x + 3(-7x + 10) = -40 Reorder the terms: 7x + 3(10 + -7x) = -40 7x + (10 * 3 + -7x * 3) = -40 7x + (30 + -21x) = -40 Reorder the terms: 30 + 7x + -21x = -40 Combine like terms: 7x + -21x = -14x 30 + -14x = -40 Solving 30 + -14x = -40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -14x = -40 + -30 Combine like terms: 30 + -30 = 0 0 + -14x = -40 + -30 -14x = -40 + -30 Combine like terms: -40 + -30 = -70 -14x = -70 Divide each side by '-14'. x = 5 Simplifying x = 5
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