It is 4r + 12s
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-2=4r+s s=-4r-2 or s=-(4r+2)
Since 4R and R both contain a like term (R), you can combine them: 5R would be 4R plus R simplified
2h2s + so2 - 2h20 + 3s
3s + 4t + 2s + 5s + 6tGroup all of the like 's' terms & 't' terms together:(3s+2s+5s) + (4t + 6t)10s + 10t or 10(s+t)
2t-4s