7(х+6)=49 3(2х-9)=27 2(2х+3х)=20

ой, 7х=7. х=1

7 (×+6)=49×+6=49÷7×+6=7×=7-6×=1 3 (2×-9)=272×-9=27÷32×-9=9×=(9+9)÷2×=9 2 (2×+3×)=202×+3×=20÷2 5×=10×=10÷5×=2