3 ( 5 y - 5 x ) = 45
3 * 5 * ( y - x ) = 3 * 3 * 5
15 ( y - x ) = 3 * 15 Divide both sides by 15
y - x = 3 Add x to both sides
y - x + x = 3 + x
y = x + 3
If you must solve y = 0
0 = x + 3 Subtrac 3 to both sides
0 - 3 = x + 3 - 3
- 3 = x
x = - 3
OR
3 ( 5 y - 5 x ) = 45 Divide both sides by 3
5 y - 5 x = 45 / 3 = 15
5 * 0 - 5 x = 15
- 5 x = 15 Divide both sides by - 5
x = 15 / - 5
x = - 3
3(5y-5x)=45
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