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Simplifying -12 + 6x = 3(1 + 7x) -12 + 6x = (1 * 3 + 7x * 3) -12 + 6x = (3 + 21x) Solving -12 + 6x = 3 + 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. -12 + 6x + -21x = 3 + 21x + -21x Combine like terms: 6x + -21x = -15x -12 + -15x = 3 + 21x + -21x Combine like terms: 21x + -21x = 0 -12 + -15x = 3 + 0 -12 + -15x = 3 Add '12' to each side of the equation. -12 + 12 + -15x = 3 + 12 Combine like terms: -12 + 12 = 0 0 + -15x = 3 + 12 -15x = 3 + 12 Combine like terms: 3 + 12 = 15 -15x = 15 Divide each side by '-15'. x = -1 Simplifying x = -1
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