(a×3-10):5+6×15=100
(a×3-10):5+90=100
(a×3-10):5=100-90
(a×3-10):5=10
a×3-10=10×5
a×3-10=50
a×3=50+10
a×3=60
a=60:3
a=20
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(a×3-10):5+6×15=100
(a×3-10):5+90=100
(a×3-10):5=100-90
(a×3-10):5=10
a×3-10=10×5
a×3-10=50
a×3=50+10
a×3=60
a=60:3
a=20