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Simplifying 21 + -7x = 3(2 + -2x) 21 + -7x = (2 * 3 + -2x * 3) 21 + -7x = (6 + -6x) Solving 21 + -7x = 6 + -6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6x' to each side of the equation. 21 + -7x + 6x = 6 + -6x + 6x Combine like terms: -7x + 6x = -1x 21 + -1x = 6 + -6x + 6x Combine like terms: -6x + 6x = 0 21 + -1x = 6 + 0 21 + -1x = 6 Add '-21' to each side of the equation. 21 + -21 + -1x = 6 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 6 + -21 -1x = 6 + -21 Combine like terms: 6 + -21 = -15 -1x = -15 Divide each side by '-1'. x = 15 Simplifying x = 15
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