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Simplifying 7x = 5(-3x) + 66 Remove parenthesis around (-3x) 7x = 5 * -3x + 66 Multiply 5 * -3 7x = -15x + 66 Reorder the terms: 7x = 66 + -15x Solving 7x = 66 + -15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15x' to each side of the equation. 7x + 15x = 66 + -15x + 15x Combine like terms: 7x + 15x = 22x 22x = 66 + -15x + 15x Combine like terms: -15x + 15x = 0 22x = 66 + 0 22x = 66 Divide each side by '22'. x = 3 Simplifying x = 3
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