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Simplifying 105 = 7 + 7(6x + -4) Reorder the terms: 105 = 7 + 7(-4 + 6x) 105 = 7 + (-4 * 7 + 6x * 7) 105 = 7 + (-28 + 42x) Combine like terms: 7 + -28 = -21 105 = -21 + 42x Solving 105 = -21 + 42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42x' to each side of the equation. 105 + -42x = -21 + 42x + -42x Combine like terms: 42x + -42x = 0 105 + -42x = -21 + 0 105 + -42x = -21 Add '-105' to each side of the equation. 105 + -105 + -42x = -21 + -105 Combine like terms: 105 + -105 = 0 0 + -42x = -21 + -105 -42x = -21 + -105 Combine like terms: -21 + -105 = -126 -42x = -126 Divide each side by '-42'. x = 3 Simplifying x = 3
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