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Simplifying 7(3x) + -21 = 7 Remove parenthesis around (3x) 7 * 3x + -21 = 7 Multiply 7 * 3 21x + -21 = 7 Reorder the terms: -21 + 21x = 7 Solving -21 + 21x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 21x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 21x = 7 + 21 21x = 7 + 21 Combine like terms: 7 + 21 = 28 21x = 28 Divide each side by '21'. x = 1.333333333 Simplifying x = 1.333333333
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