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5x-3y=26
10x-25y=90
10x-6y=52 -
-19y=38
y= -38/19
y= -2
2x-5y=18
2x-5(-2)=18
2x+10=18
2x=8
x=4
4x-7y=......
4(4)-7(-2) = 16+14 = 30