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Simplifying 3x + 4x + 12 = 145 Reorder the terms: 12 + 3x + 4x = 145 Combine like terms: 3x + 4x = 7x 12 + 7x = 145 Solving 12 + 7x = 145 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 + 7x = 145 + -12 Combine like terms: 12 + -12 = 0 0 + 7x = 145 + -12 7x = 145 + -12 Combine like terms: 145 + -12 = 133 7x = 133 Divide each side by '7'. x = 19 Simplifying x = 19
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