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Simplifying -7x + -21 = 7(x + -7) Reorder the terms: -21 + -7x = 7(x + -7) Reorder the terms: -21 + -7x = 7(-7 + x) -21 + -7x = (-7 * 7 + x * 7) -21 + -7x = (-49 + 7x) Solving -21 + -7x = -49 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -21 + -7x + -7x = -49 + 7x + -7x Combine like terms: -7x + -7x = -14x -21 + -14x = -49 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 + -14x = -49 + 0 -21 + -14x = -49 Add '21' to each side of the equation. -21 + 21 + -14x = -49 + 21 Combine like terms: -21 + 21 = 0 0 + -14x = -49 + 21 -14x = -49 + 21 Combine like terms: -49 + 21 = -28 -14x = -28 Divide each side by '-14'. x = 2 Simplifying x = 2
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