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Simplifying 9 + -7x = 42 + (-4x) Solving 9 + -7x = 42 + (-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. 9 + -7x + (4x) = 42 + (-4x) + (4x) Combine like terms: -7x + (4x) = -3x 9 + -3x = 42 + (-4x) + (4x) Combine like terms: (-4x) + (4x) = 0 9 + -3x = 42 + 0 9 + -3x = 42 Add '-9' to each side of the equation. 9 + -9 + -3x = 42 + -9 Combine like terms: 9 + -9 = 0 0 + -3x = 42 + -9 -3x = 42 + -9 Combine like terms: 42 + -9 = 33 -3x = 33 Divide each side by '-3'. x = -11 Simplifying x = -11
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