How do you work out 5a plus 7 equals 9? Put in equation form
5a+7=9 subtract 7 from both sides gives you 5a=2
divide 5 from both sides gives you a=2/5 or .4
substitute in .4 for your a to check answer
5(.4)+7=9
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5a + 2 = 7 subtract 2 from both sides: 5a = 5 divide both sides by 5: a = 1
A+5=-5a+5 A=-5a+5-5 (bring one of the 5 over)(not necessary) A=-5a (if big and small letters are the same, A=a=0; if not, when A=35,a=-7)
(5a).7 = -23 7(5a) = -23 35a = -23 a = -23/35 a= -0.657 (3 d.p.)
4
If you mean: 6a+7 = 5a then the value of a is -7