(5a).7 = -23
7(5a) = -23
35a = -23
a = -23/35
a= -0.657 (3 d.p.)
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Oh, come on! 6a - 5a = a, 7 - 5 = 2
5a - 1 = a - 7 4a = -6 a = -1.5
5a + 2 = 7 subtract 2 from both sides: 5a = 5 divide both sides by 5: a = 1
How do you work out 5a plus 7 equals 9? Put in equation form5a+7=9 subtract 7 from both sides gives you 5a=2divide 5 from both sides gives you a=2/5 or .4substitute in .4 for your a to check answer5(.4)+7=9
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)