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Simplifying x + (x + -7) + 3(x + -7) = 107 Reorder the terms: x + (-7 + x) + 3(x + -7) = 107 Remove parenthesis around (-7 + x) x + -7 + x + 3(x + -7) = 107 Reorder the terms: x + -7 + x + 3(-7 + x) = 107 x + -7 + x + (-7 * 3 + x * 3) = 107 x + -7 + x + (-21 + 3x) = 107 Reorder the terms: -7 + -21 + x + x + 3x = 107 Combine like terms: -7 + -21 = -28 -28 + x + x + 3x = 107 Combine like terms: x + x = 2x -28 + 2x + 3x = 107 Combine like terms: 2x + 3x = 5x -28 + 5x = 107 Solving -28 + 5x = 107 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 5x = 107 + 28 Combine like terms: -28 + 28 = 0 0 + 5x = 107 + 28 5x = 107 + 28 Combine like terms: 107 + 28 = 135 5x = 135 Divide each side by '5'. x = 27 Simplifying x = 27
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