It can't be an equation, there is no sign of equality.
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4a + 7
12a
It is an expression that can be simplified to: 4a+2
5a - 10 = 4a + 8 is a linear equation in one variable.
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5