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Simplifying (7x + 8y + -3) + -1(9x + 8y + -4) = 0 Reorder the terms: (-3 + 7x + 8y) + -1(9x + 8y + -4) = 0 Remove parenthesis around (-3 + 7x + 8y) -3 + 7x + 8y + -1(9x + 8y + -4) = 0 Reorder the terms: -3 + 7x + 8y + -1(-4 + 9x + 8y) = 0 -3 + 7x + 8y + (-4 * -1 + 9x * -1 + 8y * -1) = 0 -3 + 7x + 8y + (4 + -9x + -8y) = 0 Reorder the terms: -3 + 4 + 7x + -9x + 8y + -8y = 0 Combine like terms: -3 + 4 = 1 1 + 7x + -9x + 8y + -8y = 0 Combine like terms: 7x + -9x = -2x 1 + -2x + 8y + -8y = 0 Combine like terms: 8y + -8y = 0 1 + -2x + 0 = 0 1 + -2x = 0 Solving 1 + -2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -2x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -2x = 0 + -1 -2x = 0 + -1 Combine like terms: 0 + -1 = -1 -2x = -1 Divide each side by '-2'. x = 0.5 Simplifying x = 0.5
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