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Simplifying (x + 70) + (x + 70) + 2x = 400 Reorder the terms: (70 + x) + (x + 70) + 2x = 400 Remove parenthesis around (70 + x) 70 + x + (x + 70) + 2x = 400 Reorder the terms: 70 + x + (70 + x) + 2x = 400 Remove parenthesis around (70 + x) 70 + x + 70 + x + 2x = 400 Reorder the terms: 70 + 70 + x + x + 2x = 400 Combine like terms: 70 + 70 = 140 140 + x + x + 2x = 400 Combine like terms: x + x = 2x 140 + 2x + 2x = 400 Combine like terms: 2x + 2x = 4x 140 + 4x = 400 Solving 140 + 4x = 400 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-140' to each side of the equation. 140 + -140 + 4x = 400 + -140 Combine like terms: 140 + -140 = 0 0 + 4x = 400 + -140 4x = 400 + -140 Combine like terms: 400 + -140 = 260 4x = 260 Divide each side by '4'. x = 65 Simplifying x = 65
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