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Simplifying 7[3 + -1(-4x + -3)] = 140x + 126 Reorder the terms: 7[3 + -1(-3 + -4x)] = 140x + 126 7[3 + (-3 * -1 + -4x * -1)] = 140x + 126 7[3 + (3 + 4x)] = 140x + 126 Combine like terms: 3 + 3 = 6 7[6 + 4x] = 140x + 126 [6 * 7 + 4x * 7] = 140x + 126 [42 + 28x] = 140x + 126 Reorder the terms: 42 + 28x = 126 + 140x Solving 42 + 28x = 126 + 140x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-140x' to each side of the equation. 42 + 28x + -140x = 126 + 140x + -140x Combine like terms: 28x + -140x = -112x 42 + -112x = 126 + 140x + -140x Combine like terms: 140x + -140x = 0 42 + -112x = 126 + 0 42 + -112x = 126 Add '-42' to each side of the equation. 42 + -42 + -112x = 126 + -42 Combine like terms: 42 + -42 = 0 0 + -112x = 126 + -42 -112x = 126 + -42 Combine like terms: 126 + -42 = 84 -112x = 84 Divide each side by '-112'. x = -0.75 Simplifying x = -0.75
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