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Simplifying 5 + -3(z + 4) = -7 + -3z Reorder the terms: 5 + -3(4 + z) = -7 + -3z 5 + (4 * -3 + z * -3) = -7 + -3z 5 + (-12 + -3z) = -7 + -3z Combine like terms: 5 + -12 = -7 -7 + -3z = -7 + -3z Add '7' to each side of the equation. -7 + 7 + -3z = -7 + 7 + -3z Combine like terms: -7 + 7 = 0 0 + -3z = -7 + 7 + -3z -3z = -7 + 7 + -3z Combine like terms: -7 + 7 = 0 -3z = 0 + -3z -3z = -3z Add '3z' to each side of the equation. -3z + 3z = -3z + 3z Combine like terms: -3z + 3z = 0 0 = -3z + 3z Combine like terms: -3z + 3z = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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