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a + 3a - 2 + 3a. Add the a + 3a + 3a = 7a. You can't combine the -2 & 7a so the solution is: 7a - 2.
7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2
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7a=2(-10)........................................answer is 20/7
7a+10=2a 7a+10-2a=0 5a+10=0 5a=-10 a=-2