a+a+a=3a
4a+b-2a=4a-2a+b=2a+b
4s+3t-2s+2t=4s-2s+3t+2t=2s+5t
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a+a+a=3a
4a+b-2a=4a-2a+b=2a+b
4s+3t-2s+2t=4s-2s+3t+2t=2s+5t