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14 +1 = 5x
15 = 5x
15/5 = x
3 = x
x=1
x=3
x=5
x+12=2.x+5
12-5 = 2x -x
7 = x
x=7
x=3
x=12
14=5x-1
14+1=5x
15=5x
15/5=x
3=x
2.
x+12=2x+5
12-5=2x-x
7=x