Answer:
Step-by-step explanation:
x+x+9=65
2x=56
x=28
28,37
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In exercise 3 (2,6) means that x=2 and y=6
so you have to check that if this values of x and y satisfied the given equation,
by showing that the left hand side = the right hand side ..
3^4 and 3^-6
multiply, add, subtract?
divide 486 by 9 = 54
it would take about 54 minutes