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Simplifying 21 + -3(x + -7) = x + 20 Reorder the terms: 21 + -3(-7 + x) = x + 20 21 + (-7 * -3 + x * -3) = x + 20 21 + (21 + -3x) = x + 20 Combine like terms: 21 + 21 = 42 42 + -3x = x + 20 Reorder the terms: 42 + -3x = 20 + x Solving 42 + -3x = 20 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 42 + -3x + -1x = 20 + x + -1x Combine like terms: -3x + -1x = -4x 42 + -4x = 20 + x + -1x Combine like terms: x + -1x = 0 42 + -4x = 20 + 0 42 + -4x = 20 Add '-42' to each side of the equation. 42 + -42 + -4x = 20 + -42 Combine like terms: 42 + -42 = 0 0 + -4x = 20 + -42 -4x = 20 + -42 Combine like terms: 20 + -42 = -22 -4x = -22 Divide each side by '-4'. x = 5.5 Simplifying x = 5.5
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