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Simplifying 3x + 4(x + -7) = 3(x + -4) Reorder the terms: 3x + 4(-7 + x) = 3(x + -4) 3x + (-7 * 4 + x * 4) = 3(x + -4) 3x + (-28 + 4x) = 3(x + -4) Reorder the terms: -28 + 3x + 4x = 3(x + -4) Combine like terms: 3x + 4x = 7x -28 + 7x = 3(x + -4) Reorder the terms: -28 + 7x = 3(-4 + x) -28 + 7x = (-4 * 3 + x * 3) -28 + 7x = (-12 + 3x) Solving -28 + 7x = -12 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -28 + 7x + -3x = -12 + 3x + -3x Combine like terms: 7x + -3x = 4x -28 + 4x = -12 + 3x + -3x Combine like terms: 3x + -3x = 0 -28 + 4x = -12 + 0 -28 + 4x = -12 Add '28' to each side of the equation. -28 + 28 + 4x = -12 + 28 Combine like terms: -28 + 28 = 0 0 + 4x = -12 + 28 4x = -12 + 28 Combine like terms: -12 + 28 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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