Question

30+(15-2xb)x7=79
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Answer 1

( 15-2xb) x7= 79-30= 49; 15-2b= 49:7= 7; 15-7= 2b ; 8= 2b; b = 4

Answer 2

$*=ori$
$30+(15-2*b)*7=79$
$(15-2*b)*7=79-30$
$(15-2*b)*7=49$
$(15-2*b)=49:7$
$(15-2*b)=7$
$2*b=15-7$
$2*b=8$
$b=8:2$
$b=4$