A+2B=20
A+B=15
A=?
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Answer:
A=10
Step-by-step explanation:
A+2B=20
A+B+B=20
(A+B)+B=20
(15)+B=20
B=20-15
B=5
Substitute B=5 in A+B=15
A+5=15
A=15-5
A=10
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