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Simplifying (2x + -21) + (4x + -21) = 180 Reorder the terms: (-21 + 2x) + (4x + -21) = 180 Remove parenthesis around (-21 + 2x) -21 + 2x + (4x + -21) = 180 Reorder the terms: -21 + 2x + (-21 + 4x) = 180 Remove parenthesis around (-21 + 4x) -21 + 2x + -21 + 4x = 180 Reorder the terms: -21 + -21 + 2x + 4x = 180 Combine like terms: -21 + -21 = -42 -42 + 2x + 4x = 180 Combine like terms: 2x + 4x = 6x -42 + 6x = 180 Solving -42 + 6x = 180 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 + 6x = 180 + 42 Combine like terms: -42 + 42 = 0 0 + 6x = 180 + 42 6x = 180 + 42 Combine like terms: 180 + 42 = 222 6x = 222 Divide each side by '6'. x = 37 Simplifying x = 37
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