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Simplifying 5x + 3(7x + 4) = 142 Reorder the terms: 5x + 3(4 + 7x) = 142 5x + (4 * 3 + 7x * 3) = 142 5x + (12 + 21x) = 142 Reorder the terms: 12 + 5x + 21x = 142 Combine like terms: 5x + 21x = 26x 12 + 26x = 142 Solving 12 + 26x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 26x = 142 + -12 Combine like terms: 12 + -12 = 0 0 + 26x = 142 + -12 26x = 142 + -12 Combine like terms: 142 + -12 = 130 26x = 130 Divide each side by '26'. x = 5 Simplifying x = 5
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