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Simplifying 142 = 3x + 7(x + 6) Reorder the terms: 142 = 3x + 7(6 + x) 142 = 3x + (6 * 7 + x * 7) 142 = 3x + (42 + 7x) Reorder the terms: 142 = 42 + 3x + 7x Combine like terms: 3x + 7x = 10x 142 = 42 + 10x Solving 142 = 42 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 142 + -10x = 42 + 10x + -10x Combine like terms: 10x + -10x = 0 142 + -10x = 42 + 0 142 + -10x = 42 Add '-142' to each side of the equation. 142 + -142 + -10x = 42 + -142 Combine like terms: 142 + -142 = 0 0 + -10x = 42 + -142 -10x = 42 + -142 Combine like terms: 42 + -142 = -100 -10x = -100 Divide each side by '-10'. x = 10 Simplifying x = 10
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