3(5-x)-3(1-2x)=4215-3x - 3 +6x = 42+6x - 3x +15 -3 -42 = 03x -30 = 03x = 30x = 30/3x = 10
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-3x+6x=42-15+3
3x=30
x=30/3
x=10
3(5-x)-3(1-2x)=42
15-3x - 3 +6x = 42
+6x - 3x +15 -3 -42 = 0
3x -30 = 0
3x = 30
x = 30/3
x = 10