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Simplifying [x + 3(x + -4)] = x + -1 Reorder the terms: [x + 3(-4 + x)] = x + -1 [x + (-4 * 3 + x * 3)] = x + -1 [x + (-12 + 3x)] = x + -1 Reorder the terms: [-12 + x + 3x] = x + -1 Combine like terms: x + 3x = 4x [-12 + 4x] = x + -1 Remove brackets around [-12 + 4x] -12 + 4x = x + -1 Reorder the terms: -12 + 4x = -1 + x Solving -12 + 4x = -1 + 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. -12 + 4x + -1x = -1 + x + -1x Combine like terms: 4x + -1x = 3x -12 + 3x = -1 + x + -1x Combine like terms: x + -1x = 0 -12 + 3x = -1 + 0 -12 + 3x = -1 Add '12' to each side of the equation. -12 + 12 + 3x = -1 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = -1 + 12 3x = -1 + 12 Combine like terms: -1 + 12 = 11 3x = 11 Divide each side by '3'. x = 3.666666667 Simplifying x = 3.666666667
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