a,\(\left[196-4\cdot\left(5+3x\right)\right]+16=96\)
\(\left[196-4\cdot\left(5+3x\right)\right]=96-16\)
\(\left[196-4\cdot\left(5+3x\right)\right]=80\)
\(4\cdot\left(5+3x\right)=196-80\)
\(4\cdot\left(5+3x\right)=116\)
\(5+3x=116\div4\)
\(5+3x=29\)
\(3x=29-5\)
\(3x=24\)
\(x=24\div3\)
\(x=8\)
b,\(\left[6+105\div\left(35-7x\right)\right]\cdot3-7=26\)
\(\left[6+105\div\left(35-7x\right)\right]\cdot3=26+7\\ \left[6+105\div\left(35-7x\right)\right]\cdot3=33\\ \left[6+105\div\left(35-7x\right)\right]=33\div3\\ \left[6+105\div\left(35-7x\right)\right]=11\)
\(\left[105\div\left(35-7x\right)\right]=11-6\\\left[105\div\left(35-7x\right)\right]=5\\ \left(35-7x\right)=105\div5\\ \left(35-7x\right)=21\\ 7x=35-21\\7x=14\\ x=14\div7\\ x=2\)
