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15x+60=72-16x
15x+16x=72-60
31x=12
x=12/31
x=.387
Comprobación:
5(3(.387)+12)=8(9-2(.387))
5(13.161)=8(8.226)
65.805=65.808 *Se pasa unos decimales, pues solo se usan 3 en x*
11x+14=3(1-2x)+1
11x+14=3-6x+1
11x+6x=3+1-14
17x=-10
x=-10/17
x=-.588
Comprobación:
11(-.588)+14=3(1-2(-.588)+1
-6.468+14=3(2.176)+1
7.532=7.528
3x+7=2(8+x)+1
3x+7=16+2x+1
3x-2x=16+1-7
x=10
Comprobación:
3(10)+7=2(8+10)+1
30+7=2(16)+1
37=37