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= 7a + 2b -6 -6a + 5b -1
= a + 7b - 7
Semoga membantu
7a+2b-5+(-6a)+5b-1
Samakan variabelnya
7a-6a+2b+5b-6-1
a+7b-7
Jadi jawabanya adalah
a+7b-7