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OpenStudy (anonymous):
9-3(a-1)=4+a
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OpenStudy (saifoo.khan):
9 -3a + 3 = 4 + a
OpenStudy (saifoo.khan):
Add like terms.
OpenStudy (saifoo.khan):
-3a + 12 = 4 + a -3a - a = 4 - 12
OpenStudy (saifoo.khan):
-4a = -8 Cancel the -ve signs both sides. 4a = 8 a = 2
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