B)
12-8+y-3=21+4
1+y=21+4
1+y=25
y=25-1
y=24
C)
3+2a-8-5=25+3
2a-8-5=25
2a-13=25
2a=25+13
2a=38
a=19
D)
20+4-10+4p=65-34
14+4p=65-34
14+4p=31
4p=31-14
4p=17
p=17/4
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Verified answer
B)
12-8+y-3=21+4
1+y=21+4
1+y=25
y=25-1
y=24
C)
3+2a-8-5=25+3
2a-8-5=25
2a-13=25
2a=25+13
2a=38
a=19
D)
20+4-10+4p=65-34
14+4p=65-34
14+4p=31
4p=31-14
4p=17
p=17/4