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Simplifying 7x + -2 + -7(2x + 8) = -121 Reorder the terms: 7x + -2 + -7(8 + 2x) = -121 7x + -2 + (8 * -7 + 2x * -7) = -121 7x + -2 + (-56 + -14x) = -121 Reorder the terms: -2 + -56 + 7x + -14x = -121 Combine like terms: -2 + -56 = -58 -58 + 7x + -14x = -121 Combine like terms: 7x + -14x = -7x -58 + -7x = -121 Solving -58 + -7x = -121 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '58' to each side of the equation. -58 + 58 + -7x = -121 + 58 Combine like terms: -58 + 58 = 0 0 + -7x = -121 + 58 -7x = -121 + 58 Combine like terms: -121 + 58 = -63 -7x = -63 Divide each side by '-7'. x = 9 Simplifying x = 9
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