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Simplifying (x + 1) + 2(x + 3) = 19 Reorder the terms: (1 + x) + 2(x + 3) = 19 Remove parenthesis around (1 + x) 1 + x + 2(x + 3) = 19 Reorder the terms: 1 + x + 2(3 + x) = 19 1 + x + (3 * 2 + x * 2) = 19 1 + x + (6 + 2x) = 19 Reorder the terms: 1 + 6 + x + 2x = 19 Combine like terms: 1 + 6 = 7 7 + x + 2x = 19 Combine like terms: x + 2x = 3x 7 + 3x = 19 Solving 7 + 3x = 19 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3x = 19 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 19 + -7 3x = 19 + -7 Combine like terms: 19 + -7 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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