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Simplifying 6x + 7(1 + -1x) = 6.9 6x + (1 * 7 + -1x * 7) = 6.9 6x + (7 + -7x) = 6.9 Reorder the terms: 7 + 6x + -7x = 6.9 Combine like terms: 6x + -7x = -1x 7 + -1x = 6.9 Solving 7 + -1x = 6.9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 6.9 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 6.9 + -7 -1x = 6.9 + -7 Combine like terms: 6.9 + -7 = -0.1 -1x = -0.1 Divide each side by '-1'. x = 0.1 Simplifying x = 0.1
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