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4²+9x+√4= 16×5+2+7x
16+9x+2= 80+2+7x
9x-7x=82-16-2
2x=64
x=32
b)
-6x-6+3x=3x+6
-3x-6=3x+6
-6-6=3x+3x
-12=6x
-12÷6=x
-2=x
c)
3x+5x-49=2x+x+11
8x-49=3x+11
8x-3x=11+49
5x=60
x=60÷5
x=12
d)
9x+45-5x=16+5×6+3x
4x+45=16+30+3x
4x-3x=46-45
x=1