0
Anonymous
3x+7=15
-7 -7
3x=6
(Divide)
3 3
x=2
Check it:
3(2)+7=15
6+7=15
15=15
:D
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x = -11
y = 15 (by transitivity)
x = 15
3x+12x = 15 15x = 15 x = 1
10 -3x+8x = 25 -3x+8x = 25-10 5x = 15 x = 3