Solve for z
z=10
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5z+2z=70
Multiply both sides of the equation by 10, the least common multiple of 2,5.
7z=70
Combine 5z and 2z to get 7z.
z=\frac{70}{7}
Divide both sides by 7.
z=10
Divide 70 by 7 to get 10.
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