If: x+18 = 20
Then: x = 2
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If: m = 20 Then: 3m+18 = 78
2 times -20 equals 40 and 2 plus -20 equals -18
10x3+8=80-60+? 30+8=20+? 38=20+? 38-20=? 18=? The answer is 18.
so 5a = -20 making a = -4
11x = 20x +1811x-20x=18x(11-20)=18-9x=18x=-2