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Simplifying -66y + -45x + 10(7 + -123x) = 1520 -66y + -45x + (7 * 10 + -123x * 10) = 1520 -66y + -45x + (70 + -1230x) = 1520 Reorder the terms: 70 + -45x + -1230x + -66y = 1520 Combine like terms: -45x + -1230x = -1275x 70 + -1275x + -66y = 1520 Solving 70 + -1275x + -66y = 1520 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-70' to each side of the equation. 70 + -1275x + -70 + -66y = 1520 + -70 Reorder the terms: 70 + -70 + -1275x + -66y = 1520 + -70 Combine like terms: 70 + -70 = 0 0 + -1275x + -66y = 1520 + -70 -1275x + -66y = 1520 + -70 Combine like terms: 1520 + -70 = 1450 -1275x + -66y = 1450 Add '66y' to each side of the equation. -1275x + -66y + 66y = 1450 + 66y Combine like terms: -66y + 66y = 0 -1275x + 0 = 1450 + 66y -1275x = 1450 + 66y Divide each side by '-1275'. x = -1.137254902 + -0.05176470588y Simplifying x = -1.137254902 + -0.05176470588y
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