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a) 5x+3=a
5*10+3=a
a=53
c)3-4x=a-5
3-4*10=a-5
3-40=a-5
-37+5=a
a=-32
b) 2x-4=x+a
2*10-4=10+a
20-4-10=a
a=6
d) 2(x+1)+x=a
2(10+1)+10=a
22+10=a
a=32
5x=53-3/5
x=10
b) 2x-4=x+a a=6
2x-x=4 +6
x= 10
d) 2(x+1)+x=a a=31
2x+1+x=a
3x+1=31-1
3x=30/3
x=10