Do you mean:
5x + 9 - 7x + 6 = x - 18
If so, you can solve this question at this manner:
-2x + 15 = x - 18
3x = -3
x = -1
18
18.
6 - -12 = 18
10x3+8=80-60+? 30+8=20+? 38=20+? 38-20=? 18=? The answer is 18.
18 + 12 + 0 - 4 - 10 = 16
18
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5 + n = 23 n = 18 18 - 5 = 13 ■
Negative 23 + 32 minus 18 = negative 9 {-23+32-18=-9)
It is already in that form if the hyphens are taken as minus signs as 18-6-6-6 = 0. The possible restatement would be 18-(3)(6)=0. The written form would be "Eighteen minus six, minus six, minus six, equals zero."
18.
What minus 6 equals 12 is 18
6 - -12 = 18
Since minus a negative is the same as a plus, then 18 - (-18) is the same as 18+18 = 36
10x3+8=80-60+? 30+8=20+? 38=20+? 38-20=? 18=? The answer is 18.
-18
18 + 12 + 0 - 4 - 10 = 16