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Simplifying 4x + -7(x + -9) = 13x Reorder the terms: 4x + -7(-9 + x) = 13x 4x + (-9 * -7 + x * -7) = 13x 4x + (63 + -7x) = 13x Reorder the terms: 63 + 4x + -7x = 13x Combine like terms: 4x + -7x = -3x 63 + -3x = 13x Solving 63 + -3x = 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. 63 + -3x + -13x = 13x + -13x Combine like terms: -3x + -13x = -16x 63 + -16x = 13x + -13x Combine like terms: 13x + -13x = 0 63 + -16x = 0 Add '-63' to each side of the equation. 63 + -63 + -16x = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -16x = 0 + -63 -16x = 0 + -63 Combine like terms: 0 + -63 = -63 -16x = -63 Divide each side by '-16'. x = 3.9375 Simplifying x = 3.9375
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