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Simplifying -66 + -8x = 21 + -15x Solving -66 + -8x = 21 + -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. -66 + -8x + 15x = 21 + -15x + 15x Combine like terms: -8x + 15x = 7x -66 + 7x = 21 + -15x + 15x Combine like terms: -15x + 15x = 0 -66 + 7x = 21 + 0 -66 + 7x = 21 Add '66' to each side of the equation. -66 + 66 + 7x = 21 + 66 Combine like terms: -66 + 66 = 0 0 + 7x = 21 + 66 7x = 21 + 66 Combine like terms: 21 + 66 = 87 7x = 87 Divide each side by '7'. x = 12.42857143 Simplifying x = 12.42857143
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