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10x=38+12=50
x=50/10=5
b.0=6y-42
42=6y
y=42/6=7
c.15=2x+3x
5x=15
x=15/5=3
a) 38 + 12 =10x
50 = 10x
x= 5
b) 42=6y
y=7
c)15=5x
x=3