Given, 15(x−1)+4(x+3)=2(7+x)
⟹ 15x−15+4x+12=14+2x ...[By Distribution Law]
⟹ 19x−3=14+2x ...[On simplifying]
⟹ 19x−2x=14+3 ...[Transposing x terms to one side]
⟹ 17x=17
⟹ x=1.