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Simplifying 66 + 3x = 122 + -4x Solving 66 + 3x = 122 + -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. 66 + 3x + 4x = 122 + -4x + 4x Combine like terms: 3x + 4x = 7x 66 + 7x = 122 + -4x + 4x Combine like terms: -4x + 4x = 0 66 + 7x = 122 + 0 66 + 7x = 122 Add '-66' to each side of the equation. 66 + -66 + 7x = 122 + -66 Combine like terms: 66 + -66 = 0 0 + 7x = 122 + -66 7x = 122 + -66 Combine like terms: 122 + -66 = 56 7x = 56 Divide each side by '7'. x = 8 Simplifying x = 8
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