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Simplifying (2x + -7) = (4x + -21) Reorder the terms: (-7 + 2x) = (4x + -21) Remove parenthesis around (-7 + 2x) -7 + 2x = (4x + -21) Reorder the terms: -7 + 2x = (-21 + 4x) Remove parenthesis around (-21 + 4x) -7 + 2x = -21 + 4x Solving -7 + 2x = -21 + 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. -7 + 2x + -4x = -21 + 4x + -4x Combine like terms: 2x + -4x = -2x -7 + -2x = -21 + 4x + -4x Combine like terms: 4x + -4x = 0 -7 + -2x = -21 + 0 -7 + -2x = -21 Add '7' to each side of the equation. -7 + 7 + -2x = -21 + 7 Combine like terms: -7 + 7 = 0 0 + -2x = -21 + 7 -2x = -21 + 7 Combine like terms: -21 + 7 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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