Answer
m=35
↓Steps Explained:↓

Solve for m
4m - 50 = 90
Divide each side by 4
Group constants
Group our constants -50 and 90.
add 50 to both sides
4m - 50 + 50 = 90 + 50
Cancel 50 on the left side:
4m = 140
Divide each side of the equation by 4
m = 35
Final Answer
m=35
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4 unknowns using Cramers Rule