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Simplifying 145 = 3x + (x + 13) Reorder the terms: 145 = 3x + (13 + x) Remove parenthesis around (13 + x) 145 = 3x + 13 + x Reorder the terms: 145 = 13 + 3x + x Combine like terms: 3x + x = 4x 145 = 13 + 4x Solving 145 = 13 + 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. 145 + -4x = 13 + 4x + -4x Combine like terms: 4x + -4x = 0 145 + -4x = 13 + 0 145 + -4x = 13 Add '-145' to each side of the equation. 145 + -145 + -4x = 13 + -145 Combine like terms: 145 + -145 = 0 0 + -4x = 13 + -145 -4x = 13 + -145 Combine like terms: 13 + -145 = -132 -4x = -132 Divide each side by '-4'. x = 33 Simplifying x = 33
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