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Simplifying 31 + -19 = 4(x + -4) Combine like terms: 31 + -19 = 12 12 = 4(x + -4) Reorder the terms: 12 = 4(-4 + x) 12 = (-4 * 4 + x * 4) 12 = (-16 + 4x) Solving 12 = -16 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 12 + -4x = -16 + 4x + -4x Combine like terms: 4x + -4x = 0 12 + -4x = -16 + 0 12 + -4x = -16 Add '-12' to each side of the equation. 12 + -12 + -4x = -16 + -12 Combine like terms: 12 + -12 = 0 0 + -4x = -16 + -12 -4x = -16 + -12 Combine like terms: -16 + -12 = -28 -4x = -28 Divide each side by '-4'. x = 7 Simplifying x = 7
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