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Simplifying (144 + 2x) = (400) Remove parenthesis around (144 + 2x) 144 + 2x = (400) 144 + 2x = 400 Solving 144 + 2x = 400 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-144' to each side of the equation. 144 + -144 + 2x = 400 + -144 Combine like terms: 144 + -144 = 0 0 + 2x = 400 + -144 2x = 400 + -144 Combine like terms: 400 + -144 = 256 2x = 256 Divide each side by '2'. x = 128 Simplifying x = 128
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