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Simplifying (2x + -10) + -1(-7x + -21) = 4 Reorder the terms: (-10 + 2x) + -1(-7x + -21) = 4 Remove parenthesis around (-10 + 2x) -10 + 2x + -1(-7x + -21) = 4 Reorder the terms: -10 + 2x + -1(-21 + -7x) = 4 -10 + 2x + (-21 * -1 + -7x * -1) = 4 -10 + 2x + (21 + 7x) = 4 Reorder the terms: -10 + 21 + 2x + 7x = 4 Combine like terms: -10 + 21 = 11 11 + 2x + 7x = 4 Combine like terms: 2x + 7x = 9x 11 + 9x = 4 Solving 11 + 9x = 4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + 9x = 4 + -11 Combine like terms: 11 + -11 = 0 0 + 9x = 4 + -11 9x = 4 + -11 Combine like terms: 4 + -11 = -7 9x = -7 Divide each side by '9'. x = -0.7777777778 Simplifying x = -0.7777777778
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