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Simplifying 6x + -18 = 15x + -90 Reorder the terms: -18 + 6x = 15x + -90 Reorder the terms: -18 + 6x = -90 + 15x Solving -18 + 6x = -90 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. -18 + 6x + -15x = -90 + 15x + -15x Combine like terms: 6x + -15x = -9x -18 + -9x = -90 + 15x + -15x Combine like terms: 15x + -15x = 0 -18 + -9x = -90 + 0 -18 + -9x = -90 Add '18' to each side of the equation. -18 + 18 + -9x = -90 + 18 Combine like terms: -18 + 18 = 0 0 + -9x = -90 + 18 -9x = -90 + 18 Combine like terms: -90 + 18 = -72 -9x = -72 Divide each side by '-9'. x = 8 Simplifying x = 8
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