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Simplifying -21 + 7x = -3 + -3(6 + 3x) -21 + 7x = -3 + (6 * -3 + 3x * -3) -21 + 7x = -3 + (-18 + -9x) Combine like terms: -3 + -18 = -21 -21 + 7x = -21 + -9x Add '21' to each side of the equation. -21 + 21 + 7x = -21 + 21 + -9x Combine like terms: -21 + 21 = 0 0 + 7x = -21 + 21 + -9x 7x = -21 + 21 + -9x Combine like terms: -21 + 21 = 0 7x = 0 + -9x 7x = -9x Solving 7x = -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 7x + 9x = -9x + 9x Combine like terms: 7x + 9x = 16x 16x = -9x + 9x Combine like terms: -9x + 9x = 0 16x = 0 Divide each side by '16'. x = 0 Simplifying x = 0
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