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7a + 10 = 2a 7a = 2a -10 5a = -10 a = -2
-7a - 10 = 20 -3a-7a + 3a= 20 + 10-4a=30divide by negative 4a=-7.5-7x-7.5=52.5-10=42.5-3x-7.5=22.520+22.5=42.5
4a+3a-4 = 10 4a+3a = 10+4 7a = 14 a = 2
a + 18 = 7a a-a +18 = 7a-a 18 = 6a 18/6 = 6a/6 3 = a 3=a
It is: 9a-a-a = 7a