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Simplifying 7(x + -3) = 3(x + -3) Reorder the terms: 7(-3 + x) = 3(x + -3) (-3 * 7 + x * 7) = 3(x + -3) (-21 + 7x) = 3(x + -3) Reorder the terms: -21 + 7x = 3(-3 + x) -21 + 7x = (-3 * 3 + x * 3) -21 + 7x = (-9 + 3x) Solving -21 + 7x = -9 + 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. -21 + 7x + -3x = -9 + 3x + -3x Combine like terms: 7x + -3x = 4x -21 + 4x = -9 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + 4x = -9 + 0 -21 + 4x = -9 Add '21' to each side of the equation. -21 + 21 + 4x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = -9 + 21 4x = -9 + 21 Combine like terms: -9 + 21 = 12 4x = 12 Divide each side by '4'. x = 3 Simplifying x = 3
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