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Simplifying 126x + 756 + 42x + 1680 = 420 Reorder the terms: 756 + 1680 + 126x + 42x = 420 Combine like terms: 756 + 1680 = 2436 2436 + 126x + 42x = 420 Combine like terms: 126x + 42x = 168x 2436 + 168x = 420 Solving 2436 + 168x = 420 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2436' to each side of the equation. 2436 + -2436 + 168x = 420 + -2436 Combine like terms: 2436 + -2436 = 0 0 + 168x = 420 + -2436 168x = 420 + -2436 Combine like terms: 420 + -2436 = -2016 168x = -2016 Divide each side by '168'. x = -12 Simplifying x = -12
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