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Simplifying -7 + -5[2x + -5(10 + 6x)] = 0 -7 + -5[2x + (10 * -5 + 6x * -5)] = 0 -7 + -5[2x + (-50 + -30x)] = 0 Reorder the terms: -7 + -5[-50 + 2x + -30x] = 0 Combine like terms: 2x + -30x = -28x -7 + -5[-50 + -28x] = 0 -7 + [-50 * -5 + -28x * -5] = 0 -7 + [250 + 140x] = 0 Combine like terms: -7 + 250 = 243 243 + 140x = 0 Solving 243 + 140x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-243' to each side of the equation. 243 + -243 + 140x = 0 + -243 Combine like terms: 243 + -243 = 0 0 + 140x = 0 + -243 140x = 0 + -243 Combine like terms: 0 + -243 = -243 140x = -243 Divide each side by '140'. x = -1.735714286 Simplifying x = -1.735714286
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