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Simplifying 4x + 7x + 8 + 7x + 2 = 172 Reorder the terms: 8 + 2 + 4x + 7x + 7x = 172 Combine like terms: 8 + 2 = 10 10 + 4x + 7x + 7x = 172 Combine like terms: 4x + 7x = 11x 10 + 11x + 7x = 172 Combine like terms: 11x + 7x = 18x 10 + 18x = 172 Solving 10 + 18x = 172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 18x = 172 + -10 Combine like terms: 10 + -10 = 0 0 + 18x = 172 + -10 18x = 172 + -10 Combine like terms: 172 + -10 = 162 18x = 162 Divide each side by '18'. x = 9 Simplifying x = 9
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