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Simplifying 133 = 7(3x) + 7(-2) Remove parenthesis around (3x) 133 = 7 * 3x + 7(-2) Multiply 7 * 3 133 = 21x + 7(-2) Multiply 7 * -2 133 = 21x + -14 Reorder the terms: 133 = -14 + 21x Solving 133 = -14 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 133 + -21x = -14 + 21x + -21x Combine like terms: 21x + -21x = 0 133 + -21x = -14 + 0 133 + -21x = -14 Add '-133' to each side of the equation. 133 + -133 + -21x = -14 + -133 Combine like terms: 133 + -133 = 0 0 + -21x = -14 + -133 -21x = -14 + -133 Combine like terms: -14 + -133 = -147 -21x = -147 Divide each side by '-21'. x = 7 Simplifying x = 7
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