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3 = -2x + x
3 = -x |*(-1)
-3 = x
5y = 13 |:5
y = ¹³/₅
y = 2⅗
7x + 7 = 35
7x = 35 - 7
7x = 28 |:7
x = 4
3=-x/*-1
-3=x
5 y = 13/:5
y=13/5
y=2⅗
7x + 7 = 35 /-7
7x=28/:7
x=4
2x-x=-3
x=-3
5y=13 | /5
y=2,6
7x+7=35
7x=35-7
7x=28 | /7
x=4