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2z + 9.75 - 7z = 5.15
grouping terms, -5z = 5.15 - 9.75
subtracting terms on right side, -5z = -4.6
dividing both sides by -5, z = 0.92
Verifying:
Left Side = (2 x .92) + 9.75 - (7 x .92) = 1.84 + 9.75 - 6.44 = 11.69 - 6.44 = 5.15 = Right Side
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