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Simplifying -21 + -2x = -7(7x + 3) Reorder the terms: -21 + -2x = -7(3 + 7x) -21 + -2x = (3 * -7 + 7x * -7) -21 + -2x = (-21 + -49x) Add '21' to each side of the equation. -21 + 21 + -2x = -21 + 21 + -49x Combine like terms: -21 + 21 = 0 0 + -2x = -21 + 21 + -49x -2x = -21 + 21 + -49x Combine like terms: -21 + 21 = 0 -2x = 0 + -49x -2x = -49x Solving -2x = -49x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49x' to each side of the equation. -2x + 49x = -49x + 49x Combine like terms: -2x + 49x = 47x 47x = -49x + 49x Combine like terms: -49x + 49x = 0 47x = 0 Divide each side by '47'. x = 0 Simplifying x = 0
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