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Simplifying 6x + 7(x + -3) = 122 Reorder the terms: 6x + 7(-3 + x) = 122 6x + (-3 * 7 + x * 7) = 122 6x + (-21 + 7x) = 122 Reorder the terms: -21 + 6x + 7x = 122 Combine like terms: 6x + 7x = 13x -21 + 13x = 122 Solving -21 + 13x = 122 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 + 13x = 122 + 21 Combine like terms: -21 + 21 = 0 0 + 13x = 122 + 21 13x = 122 + 21 Combine like terms: 122 + 21 = 143 13x = 143 Divide each side by '13'. x = 11 Simplifying x = 11
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