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7+5=5x-2x
12=3x
x=12/3
x=4
2. 3x+2y=-7 |x1|
x-5y=-25 |x3|
= 3x+2y=-7
3x-15y=-75
17y= 68
y=4
3x+2y=-7
3x+2(4)=-7
3x+8=-7
3x=-7-8
3x=-15
x=-5
6x+4y
6(-5)+4(4)
=-30+16
=-14