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Simplifying 49 + x = 4(7 + x) 49 + x = (7 * 4 + x * 4) 49 + x = (28 + 4x) Solving 49 + x = 28 + 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. 49 + x + -4x = 28 + 4x + -4x Combine like terms: x + -4x = -3x 49 + -3x = 28 + 4x + -4x Combine like terms: 4x + -4x = 0 49 + -3x = 28 + 0 49 + -3x = 28 Add '-49' to each side of the equation. 49 + -49 + -3x = 28 + -49 Combine like terms: 49 + -49 = 0 0 + -3x = 28 + -49 -3x = 28 + -49 Combine like terms: 28 + -49 = -21 -3x = -21 Divide each side by '-3'. x = 7 Simplifying x = 7
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