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Simplifying 420 = 70x + 80x Combine like terms: 70x + 80x = 150x 420 = 150x Solving 420 = 150x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-150x' to each side of the equation. 420 + -150x = 150x + -150x Combine like terms: 150x + -150x = 0 420 + -150x = 0 Add '-420' to each side of the equation. 420 + -420 + -150x = 0 + -420 Combine like terms: 420 + -420 = 0 0 + -150x = 0 + -420 -150x = 0 + -420 Combine like terms: 0 + -420 = -420 -150x = -420 Divide each side by '-150'. x = 2.8 Simplifying x = 2.8
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