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Simplifying 3x + 7(x + -3) = 89 Reorder the terms: 3x + 7(-3 + x) = 89 3x + (-3 * 7 + x * 7) = 89 3x + (-21 + 7x) = 89 Reorder the terms: -21 + 3x + 7x = 89 Combine like terms: 3x + 7x = 10x -21 + 10x = 89 Solving -21 + 10x = 89 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 10x = 89 + 21 Combine like terms: -21 + 21 = 0 0 + 10x = 89 + 21 10x = 89 + 21 Combine like terms: 89 + 21 = 110 10x = 110 Divide each side by '10'. x = 11 Simplifying x = 11
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