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Simplifying 7 + x = -129 + (-3x) Solving 7 + x = -129 + (-3x) Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '(3x)' to each side of the equation. 7 + x + (3x) = -129 + (-3x) + (3x) Combine like terms: x + (3x) = 4x 7 + 4x = -129 + (-3x) + (3x) Combine like terms: (-3x) + (3x) = 0 7 + 4x = -129 + 0 7 + 4x = -129 Add '-7' to each side of the equation. 7 + -7 + 4x = -129 + -7 Combine like terms: 7 + -7 = 0 0 + 4x = -129 + -7 4x = -129 + -7 Combine like terms: -129 + -7 = -136 4x = -136 Divide each side by '4'. x = -34 Simplifying x = -34
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