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Simplifying 0.15(7) + 0.45(20) = x Multiply 0.15 * 7 1.05 + 0.45(20) = x Multiply 0.45 * 20 1.05 + 9 = x Combine like terms: 1.05 + 9 = 10.05 10.05 = x Solving 10.05 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 10.05 + -1x = x + -1x Combine like terms: x + -1x = 0 10.05 + -1x = 0 Add '-10.05' to each side of the equation. 10.05 + -10.05 + -1x = 0 + -10.05 Combine like terms: 10.05 + -10.05 = 0.00 0.00 + -1x = 0 + -10.05 -1x = 0 + -10.05 Combine like terms: 0 + -10.05 = -10.05 -1x = -10.05 Divide each side by '-1'. x = 10.05 Simplifying x = 10.05
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