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Simplifying 7(4 + -1x) = 18 + -7x (4 * 7 + -1x * 7) = 18 + -7x (28 + -7x) = 18 + -7x Add '7x' to each side of the equation. 28 + -7x + 7x = 18 + -7x + 7x Combine like terms: -7x + 7x = 0 28 + 0 = 18 + -7x + 7x 28 = 18 + -7x + 7x Combine like terms: -7x + 7x = 0 28 = 18 + 0 28 = 18 Solving 28 = 18 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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