y=2,5x-2
y=2,5*2-2
y=3
2,5x-2=-7
2,5x=-7+2
2,5x=-5
x=-2
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y=2,5x-2
y=2,5*2-2
y=3
y=2,5x-2
2,5x-2=-7
2,5x=-7+2
2,5x=-5
x=-2