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7x=280
x=40
(16x+40-120)/8=x+2
16x-80=8x+16
8x=96
x=12
(2x+2+14x)/14=x-2
2x+2+14x=14x-2
2x+2=-2
2x=-4
x=-2
(16x+24-25x+10)/40=(31x+27)/6
(34-9x)/40=(31x+27)/6
204-54x=1240x+1080
-1294x=-204+1080
1294x=1284
x=1284/1294
espero haberte ayudado