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Simplifying 7x + 2(4x + -21) = 108 Reorder the terms: 7x + 2(-21 + 4x) = 108 7x + (-21 * 2 + 4x * 2) = 108 7x + (-42 + 8x) = 108 Reorder the terms: -42 + 7x + 8x = 108 Combine like terms: 7x + 8x = 15x -42 + 15x = 108 Solving -42 + 15x = 108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 15x = 108 + 42 Combine like terms: -42 + 42 = 0 0 + 15x = 108 + 42 15x = 108 + 42 Combine like terms: 108 + 42 = 150 15x = 150 Divide each side by '15'. x = 10 Simplifying x = 10
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