(2) Respostas
x + 3[2x + 3(x+4)] = 20 x + 3[2x + 3x + 12] = 20 x + 3[ 5x +12] = 20 x + 15x + 36 = 20 16x = 20-36 16x = -16 x = - 1
x+3[2x+3x+12]=20 x+3[5x+12]=20 x+ 15x+36=20 16x=20-36 x=16:16 x=1
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x + 3[2x + 3(x+4)] = 20 x + 3[2x + 3x + 12] = 20 x + 3[ 5x +12] = 20 x + 15x + 36 = 20 16x = 20-36 16x = -16 x = - 1
x+3[2x+3x+12]=20 x+3[5x+12]=20 x+ 15x+36=20 16x=20-36 x=16:16 x=1