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Simplifying 4x + -7(x + -3) = 42 Reorder the terms: 4x + -7(-3 + x) = 42 4x + (-3 * -7 + x * -7) = 42 4x + (21 + -7x) = 42 Reorder the terms: 21 + 4x + -7x = 42 Combine like terms: 4x + -7x = -3x 21 + -3x = 42 Solving 21 + -3x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3x = 42 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 42 + -21 -3x = 42 + -21 Combine like terms: 42 + -21 = 21 -3x = 21 Divide each side by '-3'. x = -7 Simplifying x = -7
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