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Simplifying (7x + -3) + x + (x + -4) = 646 Reorder the terms: (-3 + 7x) + x + (x + -4) = 646 Remove parenthesis around (-3 + 7x) -3 + 7x + x + (x + -4) = 646 Reorder the terms: -3 + 7x + x + (-4 + x) = 646 Remove parenthesis around (-4 + x) -3 + 7x + x + -4 + x = 646 Reorder the terms: -3 + -4 + 7x + x + x = 646 Combine like terms: -3 + -4 = -7 -7 + 7x + x + x = 646 Combine like terms: 7x + x = 8x -7 + 8x + x = 646 Combine like terms: 8x + x = 9x -7 + 9x = 646 Solving -7 + 9x = 646 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 9x = 646 + 7 Combine like terms: -7 + 7 = 0 0 + 9x = 646 + 7 9x = 646 + 7 Combine like terms: 646 + 7 = 653 9x = 653 Divide each side by '9'. x = 72.55555556 Simplifying x = 72.55555556
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