5a + 2 = 7
subtract 2 from both sides:
5a = 5
divide both sides by 5:
a = 1
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It is a linear equation in the variable a.
5a - 10 = 4a + 8 is a linear equation in one variable.
6a + 4 = 5a - 2 means that 6a - 5a = -2 - 4 which gives a = -6
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5
2x+a=p 2x=p-a x=.5p-.5a