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Simplifying -7(3 + 5x) = -21 + -1x (3 * -7 + 5x * -7) = -21 + -1x (-21 + -35x) = -21 + -1x Add '21' to each side of the equation. -21 + 21 + -35x = -21 + 21 + -1x Combine like terms: -21 + 21 = 0 0 + -35x = -21 + 21 + -1x -35x = -21 + 21 + -1x Combine like terms: -21 + 21 = 0 -35x = 0 + -1x -35x = -1x Solving -35x = -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -35x + x = -1x + x Combine like terms: -35x + x = -34x -34x = -1x + x Combine like terms: -1x + x = 0 -34x = 0 Divide each side by '-34'. x = 0 Simplifying x = 0
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