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Simplifying 3x + (3x + -5) + x = 100 Reorder the terms: 3x + (-5 + 3x) + x = 100 Remove parenthesis around (-5 + 3x) 3x + -5 + 3x + x = 100 Reorder the terms: -5 + 3x + 3x + x = 100 Combine like terms: 3x + 3x = 6x -5 + 6x + x = 100 Combine like terms: 6x + x = 7x -5 + 7x = 100 Solving -5 + 7x = 100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 7x = 100 + 5 Combine like terms: -5 + 5 = 0 0 + 7x = 100 + 5 7x = 100 + 5 Combine like terms: 100 + 5 = 105 7x = 105 Divide each side by '7'. x = 15 Simplifying x = 15
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