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Simplifying 7x + -3(2x + -7) = 70 Reorder the terms: 7x + -3(-7 + 2x) = 70 7x + (-7 * -3 + 2x * -3) = 70 7x + (21 + -6x) = 70 Reorder the terms: 21 + 7x + -6x = 70 Combine like terms: 7x + -6x = 1x 21 + 1x = 70 Solving 21 + 1x = 70 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 + 1x = 70 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 70 + -21 1x = 70 + -21 Combine like terms: 70 + -21 = 49 1x = 49 Divide each side by '1'. x = 49 Simplifying x = 49
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