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Simplifying (x + 3) + -1(x + 4) = 12 Reorder the terms: (3 + x) + -1(x + 4) = 12 Remove parenthesis around (3 + x) 3 + x + -1(x + 4) = 12 Reorder the terms: 3 + x + -1(4 + x) = 12 3 + x + (4 * -1 + x * -1) = 12 3 + x + (-4 + -1x) = 12 Reorder the terms: 3 + -4 + x + -1x = 12 Combine like terms: 3 + -4 = -1 -1 + x + -1x = 12 Combine like terms: x + -1x = 0 -1 + 0 = 12 -1 = 12 Solving -1 = 12 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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