Complete the equation so it has infinitely many solutions. 4x+7=4(x+3)-?

Can some one me, i’ve been asking for so long

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)