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5x+10=2x+1
5x-2x=1-10
3x= -9
x= -9/3
x= -3
.............................................
4x-1= -9
4x= -9+1
4x= -8
x= -8/4
x= -2
...........................................
3a-1=2a-3
3a-2a= -3+1
a= -2
...................................
5-3(x+6)= 7(x-1)
5-3x-18=7x-7
-3x+5-18=7x-7
-3x-13=7x-7
-3x-7x= -7+13
-10x= 6
x= - 6/10
x= - 3/5