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-5x-10x = 5+10
-15x = 15
x = -1
2. 2x+5 = 4x+15
2x-4x = 15-5
-2x = 10
x = -5
3. 1/2x + 5 = 5/2x + 7
1/2x-5/2x = 7-5
-2x = 2
x = -1
semoga bermanfaat :)