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Simplifying 15(-0.8y + 2.8z) + 12y = 42z (-0.8y * 15 + 2.8z * 15) + 12y = 42z (-12y + 42z) + 12y = 42z Reorder the terms: -12y + 12y + 42z = 42z Combine like terms: -12y + 12y = 0 0 + 42z = 42z 42z = 42z Add '-42z' to each side of the equation. 42z + -42z = 42z + -42z Combine like terms: 42z + -42z = 0 0 = 42z + -42z Combine like terms: 42z + -42z = 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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