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Simplifying (7x + -3) + (12x + -7) = 189 Reorder the terms: (-3 + 7x) + (12x + -7) = 189 Remove parenthesis around (-3 + 7x) -3 + 7x + (12x + -7) = 189 Reorder the terms: -3 + 7x + (-7 + 12x) = 189 Remove parenthesis around (-7 + 12x) -3 + 7x + -7 + 12x = 189 Reorder the terms: -3 + -7 + 7x + 12x = 189 Combine like terms: -3 + -7 = -10 -10 + 7x + 12x = 189 Combine like terms: 7x + 12x = 19x -10 + 19x = 189 Solving -10 + 19x = 189 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 19x = 189 + 10 Combine like terms: -10 + 10 = 0 0 + 19x = 189 + 10 19x = 189 + 10 Combine like terms: 189 + 10 = 199 19x = 199 Divide each side by '19'. x = 10.47368421 Simplifying x = 10.47368421
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