21a2
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4a - 5 = 7a - 7 -5 = 3a - 7 2 = 3a a = 3/2
-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
4a-2=7a-6 4=3a a=4/3