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=20x+8-9x+6=12
=11x+14=12
=11x=-2
x=-2/11
no.8 = 9/4+5(1-y)=1-4y
= kedua persaman dikalikan 4
=36+20-2y+4-16y
=56-2y=4-16y
=14y=-52
y=-3