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Simplifying 70 = (-7)(-2) + -1(-7)(-2z) Multiply -7 * -2 70 = 14 + -1(-7)(-2z) Remove parenthesis around (-2z) 70 = 14 + -1 * -7 * -2z Multiply -1 * -7 70 = 14 + 7 * -2z Multiply 7 * -2 70 = 14 + -14z Solving 70 = 14 + -14z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '14z' to each side of the equation. 70 + 14z = 14 + -14z + 14z Combine like terms: -14z + 14z = 0 70 + 14z = 14 + 0 70 + 14z = 14 Add '-70' to each side of the equation. 70 + -70 + 14z = 14 + -70 Combine like terms: 70 + -70 = 0 0 + 14z = 14 + -70 14z = 14 + -70 Combine like terms: 14 + -70 = -56 14z = -56 Divide each side by '14'. z = -4 Simplifying z = -4
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