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Simplifying 3(6x + -7) + -15x = 13 Reorder the terms: 3(-7 + 6x) + -15x = 13 (-7 * 3 + 6x * 3) + -15x = 13 (-21 + 18x) + -15x = 13 Combine like terms: 18x + -15x = 3x -21 + 3x = 13 Solving -21 + 3x = 13 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 + 3x = 13 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 13 + 21 3x = 13 + 21 Combine like terms: 13 + 21 = 34 3x = 34 Divide each side by '3'. x = 11.33333333 Simplifying x = 11.33333333
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