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Simplifying 20 + -4(18z + 20) = 4(-18z + -15) Reorder the terms: 20 + -4(20 + 18z) = 4(-18z + -15) 20 + (20 * -4 + 18z * -4) = 4(-18z + -15) 20 + (-80 + -72z) = 4(-18z + -15) Combine like terms: 20 + -80 = -60 -60 + -72z = 4(-18z + -15) Reorder the terms: -60 + -72z = 4(-15 + -18z) -60 + -72z = (-15 * 4 + -18z * 4) -60 + -72z = (-60 + -72z) Add '60' to each side of the equation. -60 + 60 + -72z = -60 + 60 + -72z Combine like terms: -60 + 60 = 0 0 + -72z = -60 + 60 + -72z -72z = -60 + 60 + -72z Combine like terms: -60 + 60 = 0 -72z = 0 + -72z -72z = -72z Add '72z' to each side of the equation. -72z + 72z = -72z + 72z Combine like terms: -72z + 72z = 0 0 = -72z + 72z Combine like terms: -72z + 72z = 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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