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Simplifying -7x + -2(2x + -21) = -90 Reorder the terms: -7x + -2(-21 + 2x) = -90 -7x + (-21 * -2 + 2x * -2) = -90 -7x + (42 + -4x) = -90 Reorder the terms: 42 + -7x + -4x = -90 Combine like terms: -7x + -4x = -11x 42 + -11x = -90 Solving 42 + -11x = -90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + -11x = -90 + -42 Combine like terms: 42 + -42 = 0 0 + -11x = -90 + -42 -11x = -90 + -42 Combine like terms: -90 + -42 = -132 -11x = -132 Divide each side by '-11'. x = 12 Simplifying x = 12
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