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Simplifying -3(1 + 3x) = 7 + -7x (1 * -3 + 3x * -3) = 7 + -7x (-3 + -9x) = 7 + -7x Solving -3 + -9x = 7 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -3 + -9x + 7x = 7 + -7x + 7x Combine like terms: -9x + 7x = -2x -3 + -2x = 7 + -7x + 7x Combine like terms: -7x + 7x = 0 -3 + -2x = 7 + 0 -3 + -2x = 7 Add '3' to each side of the equation. -3 + 3 + -2x = 7 + 3 Combine like terms: -3 + 3 = 0 0 + -2x = 7 + 3 -2x = 7 + 3 Combine like terms: 7 + 3 = 10 -2x = 10 Divide each side by '-2'. x = -5 Simplifying x = -5
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