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