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Simplifying 3x + 3(-7x + -26) = 138 Reorder the terms: 3x + 3(-26 + -7x) = 138 3x + (-26 * 3 + -7x * 3) = 138 3x + (-78 + -21x) = 138 Reorder the terms: -78 + 3x + -21x = 138 Combine like terms: 3x + -21x = -18x -78 + -18x = 138 Solving -78 + -18x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '78' to each side of the equation. -78 + 78 + -18x = 138 + 78 Combine like terms: -78 + 78 = 0 0 + -18x = 138 + 78 -18x = 138 + 78 Combine like terms: 138 + 78 = 216 -18x = 216 Divide each side by '-18'. x = -12 Simplifying x = -12
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