3z+7z=50
Add 3z and 7z.
10z=50
Divide each term in 10z=50 by 10.
10z10=5010
Cancel the common factor of 10.
Cancel the common factor.
10z10=5010
Divide z by 1.
z=5010
z=5010
Divide 50 by 10.
z=5
z=5
Solve for z 3z+7z=50
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