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Simplifying (3x + 1) + -1(-3x + -7) + -9x = 4 Reorder the terms: (1 + 3x) + -1(-3x + -7) + -9x = 4 Remove parenthesis around (1 + 3x) 1 + 3x + -1(-3x + -7) + -9x = 4 Reorder the terms: 1 + 3x + -1(-7 + -3x) + -9x = 4 1 + 3x + (-7 * -1 + -3x * -1) + -9x = 4 1 + 3x + (7 + 3x) + -9x = 4 Reorder the terms: 1 + 7 + 3x + 3x + -9x = 4 Combine like terms: 1 + 7 = 8 8 + 3x + 3x + -9x = 4 Combine like terms: 3x + 3x = 6x 8 + 6x + -9x = 4 Combine like terms: 6x + -9x = -3x 8 + -3x = 4 Solving 8 + -3x = 4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -3x = 4 + -8 Combine like terms: 8 + -8 = 0 0 + -3x = 4 + -8 -3x = 4 + -8 Combine like terms: 4 + -8 = -4 -3x = -4 Divide each side by '-3'. x = 1.333333333 Simplifying x = 1.333333333
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