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Simplifying 140 = 7x + 7(x + -4) Reorder the terms: 140 = 7x + 7(-4 + x) 140 = 7x + (-4 * 7 + x * 7) 140 = 7x + (-28 + 7x) Reorder the terms: 140 = -28 + 7x + 7x Combine like terms: 7x + 7x = 14x 140 = -28 + 14x Solving 140 = -28 + 14x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14x' to each side of the equation. 140 + -14x = -28 + 14x + -14x Combine like terms: 14x + -14x = 0 140 + -14x = -28 + 0 140 + -14x = -28 Add '-140' to each side of the equation. 140 + -140 + -14x = -28 + -140 Combine like terms: 140 + -140 = 0 0 + -14x = -28 + -140 -14x = -28 + -140 Combine like terms: -28 + -140 = -168 -14x = -168 Divide each side by '-14'. x = 12 Simplifying x = 12
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