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Simplifying 7x + -15 = 3x + 5 + 4(x + -20) Reorder the terms: -15 + 7x = 3x + 5 + 4(x + -20) Reorder the terms: -15 + 7x = 3x + 5 + 4(-20 + x) -15 + 7x = 3x + 5 + (-20 * 4 + x * 4) -15 + 7x = 3x + 5 + (-80 + 4x) Reorder the terms: -15 + 7x = 5 + -80 + 3x + 4x Combine like terms: 5 + -80 = -75 -15 + 7x = -75 + 3x + 4x Combine like terms: 3x + 4x = 7x -15 + 7x = -75 + 7x Add '-7x' to each side of the equation. -15 + 7x + -7x = -75 + 7x + -7x Combine like terms: 7x + -7x = 0 -15 + 0 = -75 + 7x + -7x -15 = -75 + 7x + -7x Combine like terms: 7x + -7x = 0 -15 = -75 + 0 -15 = -75 Solving -15 = -75 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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