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Simplifying (21x + -5) + -12 = 56(25 + 7x) Reorder the terms: (-5 + 21x) + -12 = 56(25 + 7x) Remove parenthesis around (-5 + 21x) -5 + 21x + -12 = 56(25 + 7x) Reorder the terms: -5 + -12 + 21x = 56(25 + 7x) Combine like terms: -5 + -12 = -17 -17 + 21x = 56(25 + 7x) -17 + 21x = (25 * 56 + 7x * 56) -17 + 21x = (1400 + 392x) Solving -17 + 21x = 1400 + 392x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-392x' to each side of the equation. -17 + 21x + -392x = 1400 + 392x + -392x Combine like terms: 21x + -392x = -371x -17 + -371x = 1400 + 392x + -392x Combine like terms: 392x + -392x = 0 -17 + -371x = 1400 + 0 -17 + -371x = 1400 Add '17' to each side of the equation. -17 + 17 + -371x = 1400 + 17 Combine like terms: -17 + 17 = 0 0 + -371x = 1400 + 17 -371x = 1400 + 17 Combine like terms: 1400 + 17 = 1417 -371x = 1417 Divide each side by '-371'. x = -3.819407008 Simplifying x = -3.819407008
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